Attach images to notes, stored on dufs and kept offline

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

AGENTS.md

@@ -68,6 +68,7 @@ Three layers under `lib/`, each single-purpose:
     token. `sync_settings.dart`: persisted owner/repo/token/clientId.
   - `notes_markdown.dart`: round-trippable single-file export/import format
     (HTML-comment `<!-- @note id=… priority=… status=… … -->` markers).
+- `images/` + `attachments/` — attached images (see "Images" below).
 - `ui/` — screens, all take an injected `NoteRepository`.
   - `capture_screen.dart`: landing screen; always-focused text box pre-filled
     with the structured template; lazy note creation on first keystroke.
@@ -98,11 +99,29 @@ that, the stepper would fold a retired section into its neighbour on the next
 save. `tool/migrate_backlog.dart` converts an old export (Settings → Export →
 migrate → Settings → Import).
 
+### Images
+
+A note never holds image bytes, only a line
+`![](https://kuhy-cloud.duckdns.org/todo-images/<noteId>/<uuid>.jpg)`
+(`lib/images/image_ref.dart` owns that shape), so sync and older builds are
+untouched. Every image is re-encoded before it leaves the device: ≤2560 px,
+JPEG q85, EXIF stripped after applying its rotation (`image_processing.dart`).
+`ImageCacheStore` keeps every linked image on-device (offline) plus a
+`.pending` marker per queued upload, and `reconcile` uploads, prefetches and
+evicts (never an empty ref set, never within 10 min). Android talks to dufs
+directly with the `todo` login's password (Settings → Cloud images); the
+desktop page never does — the wrapper's `/images/*` routes do, with
+`~/.config/dufs/logins/todo.env`, created by
+`~/src/dufs-cloud/scripts/add_dufs_login.sh todo /todo-images rw`. BACKLOG.md
+rewrites links to `~/data/cloud/todo-images/…` so an agent can open them.
+
 ## Testing
 
-- **The suite must stay quick and fully green.** It is currently **313 tests at
+- **The suite must stay quick and fully green.** It is currently **418 tests at
-  100% line coverage** (2005 lines), running well under a minute on this
+  100% line coverage** (2494 lines), ~30s on this machine with
-  machine. Don't regress either.
+  `--concurrency=3` (unbounded concurrency under `capped.sh`'s 4 GiB gets its
+  test processes SIGTERMed while the wrapper still exits 0 — check the last
+  line says "All tests passed"). Don't regress either.
   (The "~5s" figure this file used to quote had drifted well before the port
   guard was added; measure before quoting a new one.)
 - Widget tests use `test/fake_note_repository.dart` — a `FakeNoteRepository`

lib/attachments/image_password_store.dart

@@ -0,0 +1,56 @@
+/// The phone's copy of the `todo` dufs login password, in the OS keystore.
+///
+/// Created on the PC by `add_dufs_login.sh todo /todo-images rw` and pasted
+/// into Settings → Cloud images. The desktop never uses this: its wrapper
+/// reads `~/.config/dufs/logins/todo.env` instead.
+library;
+
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+import 'package:todo/images/dufs_image_client.dart';
+
+/// The login name `add_dufs_login.sh` was run with.
+const kDufsImagesUser = 'todo';
+
+/// Reads and writes the password; failures read as "no password".
+class ImagePasswordStore {
+  /// Creates a store over [storage] (injectable for tests).
+  const ImagePasswordStore({FlutterSecureStorage? storage})
+    : _storage = storage ?? const FlutterSecureStorage();
+
+  final FlutterSecureStorage _storage;
+
+  static const _key = 'dufsImagesPassword';
+
+  /// The saved password, or '' when none is set or the keystore is
+  /// unavailable.
+  Future<String> read() async {
+    try {
+      return await _storage.read(key: _key) ?? '';
+    } on Exception {
+      return '';
+    }
+  }
+
+  /// Saves [password] (an empty one deletes it); false if the keystore is
+  /// unavailable.
+  Future<bool> write(String password) async {
+    try {
+      if (password.isEmpty) {
+        await _storage.delete(key: _key);
+      } else {
+        await _storage.write(key: _key, value: password);
+      }
+      return true;
+    } on Exception {
+      return false;
+    }
+  }
+
+  /// The full login, or null when no password is saved.
+  Future<DufsLogin?> login() async {
+    final password = await read();
+    if (password.isEmpty) return null;
+    return DufsLogin(user: kDufsImagesUser, password: password);
+  }
+}

lib/attachments/image_store.dart

@@ -0,0 +1,7 @@
+/// `openImageStore()` for the current platform: app storage + direct dufs on
+/// Android, the local wrapper's `/images/*` routes on the desktop web build.
+library;
+
+export 'image_store_api.dart';
+export 'image_store_io.dart'
+    if (dart.library.js_interop) 'image_store_web.dart';

lib/attachments/image_store_api.dart

@@ -0,0 +1,113 @@
+/// What the UI asks of attached images, independent of platform.
+///
+/// Android keeps images itself (an `ImageCacheStore` in app storage, talking
+/// to dufs directly); the desktop web page delegates everything to the local
+/// wrapper's `/images/*` routes. Both implement [ImageStore], picked by the
+/// conditional export in `image_store.dart`.
+library;
+
+import 'package:flutter/foundation.dart';
+
+import 'package:todo/images/image_ref.dart';
+
+/// Where to draw an image from right now.
+sealed class ImageSource {
+  const ImageSource();
+}
+
+/// A file on this device.
+final class LocalImageSource extends ImageSource {
+  /// Creates a source for the file at [path].
+  const LocalImageSource(this.path);
+
+  /// Absolute path of the cached JPEG.
+  final String path;
+}
+
+/// A same-origin URL served by the desktop wrapper.
+final class NetworkImageSource extends ImageSource {
+  /// Creates a source for [url].
+  const NetworkImageSource(this.url);
+
+  /// The wrapper URL, e.g. `http://localhost:8730/images/<noteId>/<uuid>.jpg`.
+  final String url;
+}
+
+/// Not on this device yet (it downloads on the next reconcile).
+final class MissingImageSource extends ImageSource {
+  /// The one instance.
+  const MissingImageSource();
+}
+
+/// Summary for the settings screen.
+class ImageStoreStatus {
+  /// Creates a status.
+  const ImageStoreStatus({required this.configured, required this.pending});
+
+  /// Whether a dufs login is available to this device.
+  final bool configured;
+
+  /// Images waiting to upload.
+  final int pending;
+}
+
+/// Thrown by [ImageStore.attach] when the image could not be stored at all.
+class ImageStoreException implements Exception {
+  /// Creates an exception carrying [message].
+  const ImageStoreException(this.message);
+
+  /// What went wrong, shown to the user.
+  final String message;
+
+  @override
+  String toString() => message;
+}
+
+/// Stores, shows and syncs the images notes link to. Notifies when an image
+/// becomes available or changes state, so embeds can redraw.
+abstract class ImageStore extends ChangeNotifier {
+  /// Stores [bytes] (any image format) for [noteId] and queues the upload.
+  ///
+  /// Returns the new ref, or null when [bytes] is not an image. Throws
+  /// [ImageStoreException] when it cannot be stored.
+  Future<ImageRef?> attach(String noteId, Uint8List bytes);
+
+  /// Uploads the queue, fetches every image [noteTexts] link to that this
+  /// device lacks, and evicts cached images no note links to.
+  Future<void> reconcile(Iterable<String> noteTexts);
+
+  /// Where to draw [ref] from.
+  ImageSource sourceFor(ImageRef ref);
+
+  /// Whether [ref] is still waiting to upload (always false when unknown).
+  bool isPending(ImageRef ref);
+
+  /// Login and queue summary.
+  Future<ImageStoreStatus> status();
+}
+
+/// Every image ref across [noteTexts].
+Set<ImageRef> imageRefsAcross(Iterable<String> noteTexts) => {
+  for (final text in noteTexts) ...imageRefsIn(text),
+};
+
+/// The store used where none was provided (tests, and any screen built
+/// outside the app root): attaching is refused, nothing is ever available.
+class NoImageStore extends ImageStore {
+  @override
+  Future<ImageRef?> attach(String noteId, Uint8List bytes) async =>
+      throw const ImageStoreException('Images are not available here');
+
+  @override
+  Future<void> reconcile(Iterable<String> noteTexts) async {}
+
+  @override
+  ImageSource sourceFor(ImageRef ref) => const MissingImageSource();
+
+  @override
+  bool isPending(ImageRef ref) => false;
+
+  @override
+  Future<ImageStoreStatus> status() async =>
+      const ImageStoreStatus(configured: false, pending: 0);
+}

lib/attachments/image_store_io.dart

@@ -0,0 +1,101 @@
+/// Android: images live in app storage and sync with dufs directly.
+library;
+
+import 'dart:async';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:http/http.dart' as http;
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart';
+
+import 'package:todo/attachments/image_password_store.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/images/dufs_image_client.dart';
+import 'package:todo/images/image_cache_store.dart';
+import 'package:todo/images/image_processing.dart';
+import 'package:todo/images/image_ref.dart';
+
+/// Opens the store under the app-support directory's `images/`.
+// coverage:ignore-start
+// Platform wiring only: path_provider has no binding in unit tests, which
+// construct [IoImageStore] over a temp directory instead.
+Future<ImageStore> openImageStore() async {
+  final support = await getApplicationSupportDirectory();
+  final root = Directory(p.join(support.path, 'images'));
+  return IoImageStore(ImageCacheStore(root));
+}
+// coverage:ignore-end
+
+/// [ImageStore] over a local [ImageCacheStore], uploading with the login
+/// from [ImagePasswordStore].
+class IoImageStore extends ImageStore {
+  /// Creates a store over [cache]; the rest is injectable for tests.
+  IoImageStore(
+    this.cache, {
+    this._passwords = const ImagePasswordStore(),
+    http.Client Function()? httpClient,
+    Future<Uint8List?> Function(Uint8List)? prepare,
+  }) : _httpClient = httpClient ?? http.Client.new,
+       _prepare = prepare ?? prepareImageInBackground;
+
+  /// The on-device images and upload queue.
+  final ImageCacheStore cache;
+
+  final ImagePasswordStore _passwords;
+  final http.Client Function() _httpClient;
+  final Future<Uint8List?> Function(Uint8List) _prepare;
+
+  @override
+  Future<ImageRef?> attach(String noteId, Uint8List bytes) async {
+    final jpeg = await _prepare(bytes);
+    if (jpeg == null) return null;
+    final ref = ImageRef.create(noteId);
+    try {
+      await cache.put(ref, jpeg);
+    } on FileSystemException catch (e) {
+      throw ImageStoreException('Could not save the image: ${e.message}');
+    }
+    notifyListeners();
+    // Upload right away when online. An empty ref set never evicts, so this
+    // cannot race the link reaching the note.
+    unawaited(_sync(const {}));
+    return ref;
+  }
+
+  @override
+  Future<void> reconcile(Iterable<String> noteTexts) =>
+      _sync(imageRefsAcross(noteTexts));
+
+  Future<void> _sync(Set<ImageRef> refs) async {
+    final login = await _passwords.login();
+    final client = login == null
+        ? null
+        : DufsImageClient(login, httpClient: _httpClient());
+    try {
+      final report = await cache.reconcile(refs, client);
+      if (report.uploaded + report.downloaded + report.evicted > 0) {
+        notifyListeners();
+      }
+    } finally {
+      client?.close();
+    }
+  }
+
+  @override
+  ImageSource sourceFor(ImageRef ref) {
+    final file = cache.fileFor(ref);
+    return file.existsSync()
+        ? LocalImageSource(file.path)
+        : const MissingImageSource();
+  }
+
+  @override
+  bool isPending(ImageRef ref) => cache.isPending(ref);
+
+  @override
+  Future<ImageStoreStatus> status() async => ImageStoreStatus(
+    configured: await _passwords.login() != null,
+    pending: cache.pending().length,
+  );
+}

lib/attachments/image_store_scope.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/widgets.dart';
+
+import 'package:todo/attachments/image_store_api.dart';
+
+/// Makes the app's one [ImageStore] reachable from any widget below it,
+/// without threading it through every screen constructor.
+///
+/// Screens built without a scope (most widget tests) get a shared
+/// [NoImageStore], so they render and simply cannot attach.
+class ImageStoreScope extends InheritedNotifier<ImageStore> {
+  /// Provides [store] to [child].
+  const ImageStoreScope({
+    required ImageStore store,
+    required super.child,
+    super.key,
+  }) : super(notifier: store);
+
+  static final ImageStore _none = NoImageStore();
+
+  /// The nearest store, subscribing [context] to its changes.
+  static ImageStore of(BuildContext context) =>
+      context.dependOnInheritedWidgetOfExactType<ImageStoreScope>()?.notifier ??
+      _none;
+
+  /// The nearest store, without subscribing (for callbacks).
+  static ImageStore read(BuildContext context) =>
+      context.getInheritedWidgetOfExactType<ImageStoreScope>()?.notifier ??
+      _none;
+}

lib/attachments/image_store_web.dart

@@ -0,0 +1,103 @@
+/// Desktop (web build): every image operation goes through the local
+/// wrapper's `/images/*` routes; the page never sees the dufs password.
+library;
+
+import 'dart:async';
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:http/http.dart' as http;
+
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/sync/desktop_wrapper.dart';
+
+/// Opens the store against the wrapper that served this page.
+Future<ImageStore> openImageStore() async =>
+    WebImageStore(origin: servingWrapperOrigin());
+
+/// [ImageStore] backed by the desktop wrapper at [origin].
+class WebImageStore extends ImageStore {
+  /// Creates a store talking to [origin]; [httpClient] is injectable.
+  WebImageStore({required this.origin, http.Client? httpClient})
+    : _http = httpClient ?? http.Client();
+
+  /// The wrapper's origin, e.g. `http://localhost:8730`.
+  final String origin;
+
+  final http.Client _http;
+
+  // Bumped whenever the wrapper may hold new bytes, so an image that failed
+  // to load (not downloaded yet) is requested again under a fresh URL.
+  int _revision = 0;
+
+  Uri _images(String rest) => Uri.parse('$origin/images/$rest');
+
+  @override
+  Future<ImageRef?> attach(String noteId, Uint8List bytes) async {
+    final ref = ImageRef.create(noteId);
+    final http.Response response;
+    try {
+      response = await _http.post(_images(ref.relativePath), body: bytes);
+    } on Exception {
+      throw const ImageStoreException(
+        'The desktop helper is not running; the image was not saved',
+      );
+    }
+    if (response.statusCode == 415) return null;
+    if (response.statusCode != 204) {
+      throw ImageStoreException(
+        'The desktop helper refused the image (${response.statusCode})',
+      );
+    }
+    _revision++;
+    notifyListeners();
+    unawaited(_reconcile(const {}));
+    return ref;
+  }
+
+  @override
+  Future<void> reconcile(Iterable<String> noteTexts) =>
+      _reconcile(imageRefsAcross(noteTexts));
+
+  Future<void> _reconcile(Set<ImageRef> refs) async {
+    try {
+      final response = await _http.post(
+        _images('reconcile'),
+        headers: {'content-type': 'application/json'},
+        body: jsonEncode({
+          'refs': [for (final ref in refs) ref.relativePath],
+        }),
+      );
+      if (response.statusCode != 200) return;
+      final report = jsonDecode(response.body) as Map<String, dynamic>;
+      if ((report['downloaded'] as int? ?? 0) > 0) {
+        _revision++;
+        notifyListeners();
+      }
+    } on Exception {
+      // Best-effort: the next sync, resume or attach reconciles again.
+    }
+  }
+
+  @override
+  ImageSource sourceFor(ImageRef ref) =>
+      NetworkImageSource('$origin/images/${ref.relativePath}?r=$_revision');
+
+  @override
+  bool isPending(ImageRef ref) => false;
+
+  @override
+  Future<ImageStoreStatus> status() async {
+    try {
+      final response = await _http.get(_images('status'));
+      final body = jsonDecode(response.body) as Map<String, dynamic>;
+      return ImageStoreStatus(
+        configured: body['configured'] as bool? ?? false,
+        pending: body['pending'] as int? ?? 0,
+      );
+    } on Exception {
+      return const ImageStoreStatus(configured: false, pending: 0);
+    }
+  }
+}

lib/data/note_template_parser.dart

@@ -17,6 +17,7 @@
 library;
 
 import 'package:todo/data/note_template.dart';
+import 'package:todo/images/image_ref.dart';
 
 /// Matches a single `http(s)://…` token.
 final RegExp _linkPattern = RegExp(r'^https?://\S+$');
@@ -140,14 +141,25 @@ ParsedNote parse(NoteTemplate template, String text) {
 }
 
 /// The note's display title: the `#` heading text without its `#` marker, or
-/// the first non-empty line for freeform notes.
+/// the first non-empty line for freeform notes. Attached-image lines are
+/// skipped (a 120-char dufs URL is no title); a note of nothing but images
+/// is titled by their count.
 String noteTitle(String text) {
+  var images = 0;
   for (final line in text.split('\n')) {
     final trimmed = line.trim();
     if (trimmed.isEmpty) continue;
+    if (imageRefOfLine(trimmed) != null) {
+      images++;
+      continue;
+    }
     return trimmed.replaceFirst(RegExp(r'^#+\s*'), '');
   }
-  return '';
+  return switch (images) {
+    0 => '',
+    1 => 'Image',
+    _ => '$images images',
+  };
 }
 
 /// Returns the section whose `## label` heading is on [line], or null. Only

lib/data/repository_factory_web.dart

@@ -14,7 +14,7 @@ Future<NoteRepository> openRepository() async {
   final database = await WebLogPersistence.openDatabase(idbFactoryBrowser);
   final persistence = WebLogPersistence(
     database: database,
-    backup: DesktopBackupClient(baseUrl: desktopWrapperOrigin),
+    backup: DesktopBackupClient(baseUrl: servingWrapperOrigin()),
   );
 
   final prefs = await SharedPreferences.getInstance();

lib/desktop/dufs_login_env.dart

@@ -0,0 +1,37 @@
+/// Reads the dufs login `add_dufs_login.sh` wrote for the desktop wrapper.
+///
+/// `~/src/dufs-cloud/scripts/add_dufs_login.sh todo /todo-images rw` leaves a
+/// 0600 `~/.config/dufs/logins/todo.env` of `KEY=value` lines. The wrapper
+/// re-reads it on every reconcile, so creating or rotating the login takes
+/// effect without restarting the desktop app.
+library;
+
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+
+import 'package:todo/images/dufs_image_client.dart';
+
+/// `~/.config/dufs/logins/todo.env` under [home].
+String defaultDufsLoginEnvPath(String home) =>
+    p.join(home, '.config', 'dufs', 'logins', 'todo.env');
+
+/// The login in [envFile], or null when it is absent or incomplete.
+DufsLogin? readDufsLoginEnv(File envFile) {
+  if (!envFile.existsSync()) return null;
+  final values = <String, String>{};
+  for (final line in envFile.readAsLinesSync()) {
+    final eq = line.indexOf('=');
+    if (eq <= 0 || line.startsWith('#')) continue;
+    values[line.substring(0, eq).trim()] = line.substring(eq + 1).trim();
+  }
+  final user = values['DUFS_USER'] ?? '';
+  final password = values['DUFS_PASSWORD'] ?? '';
+  final url = values['DUFS_URL'] ?? '';
+  if (user.isEmpty || password.isEmpty || url.isEmpty) return null;
+  return DufsLogin(
+    user: user,
+    password: password,
+    baseUrl: url.endsWith('/') ? url.substring(0, url.length - 1) : url,
+  );
+}

lib/desktop/wrapper_image_routes.dart

@@ -0,0 +1,159 @@
+/// The desktop wrapper's `/images/*` routes: the web page's only way to
+/// store, show and sync attached images.
+///
+/// The page never talks to dufs itself. That keeps the dufs password out of
+/// the browser, needs no CORS on dufs, and gives the desktop the same offline
+/// store the phone has (an [ImageCacheStore] on disk). Same-origin with the
+/// page, so an `<img src="/images/…">` just works.
+///
+/// * `POST /images/<noteId>/<uuid>.jpg` — raw bytes of any image; re-encoded
+///   here (the page must not decode on its UI thread), stored, queued.
+///   415 when the bytes are not an image.
+/// * `GET  /images/<noteId>/<uuid>.jpg` — the cached JPEG, 404 when absent.
+/// * `POST /images/reconcile` — `{"refs": ["<noteId>/<uuid>.jpg", …]}`: every
+///   image the notes link to. Uploads the queue, fetches what is missing,
+///   evicts the rest; answers with the [ReconcileReport].
+/// * `GET  /images/status` — `{"configured": bool, "pending": n}`.
+library;
+
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:http/http.dart' as http;
+
+import 'package:todo/desktop/dufs_login_env.dart';
+import 'package:todo/desktop/wrapper_paths.dart';
+import 'package:todo/images/dufs_image_client.dart';
+import 'package:todo/images/image_cache_store.dart';
+import 'package:todo/images/image_processing.dart';
+import 'package:todo/images/image_ref.dart';
+
+/// Largest upload accepted from the page, before re-encoding (a raw 50 MP
+/// phone photo is ~25 MB).
+const int kMaxImageUploadBytes = 64 * 1024 * 1024;
+
+/// The routes the real wrapper uses: cache under
+/// `~/.local/share/todo-desktop/images`, login from `todo.env`.
+WrapperImageRoutes defaultWrapperImageRoutes(String home) => WrapperImageRoutes(
+  store: ImageCacheStore(Directory(defaultImageCachePath(home))),
+  loginEnvPath: defaultDufsLoginEnvPath(home),
+);
+
+/// Handles `/images/*` for the wrapper.
+class WrapperImageRoutes {
+  /// Creates the routes over [store], reading the dufs login from
+  /// [loginEnvPath]. [httpClient] and [prepare] are injectable for tests.
+  WrapperImageRoutes({
+    required this.store,
+    required this.loginEnvPath,
+    http.Client Function()? httpClient,
+    Future<Uint8List?> Function(Uint8List)? prepare,
+  }) : _httpClient = httpClient ?? http.Client.new,
+       _prepare = prepare ?? prepareImageInBackground;
+
+  /// The on-disk image cache and upload queue.
+  final ImageCacheStore store;
+
+  /// `todo.env` written by `add_dufs_login.sh`.
+  final String loginEnvPath;
+
+  final http.Client Function() _httpClient;
+  final Future<Uint8List?> Function(Uint8List) _prepare;
+
+  static const _prefix = '/images/';
+
+  /// Answers [request] and returns true when it is an `/images/` route.
+  Future<bool> handle(HttpRequest request) async {
+    final path = request.uri.path;
+    if (!path.startsWith(_prefix)) return false;
+    final rest = path.substring(_prefix.length);
+    final response = request.response;
+    final method = request.method;
+    if (rest == 'reconcile' && method == 'POST') {
+      await _reconcile(request);
+    } else if (rest == 'status' && method == 'GET') {
+      _json(response, {
+        'configured': _login() != null,
+        'pending': store.pending().length,
+      });
+    } else if (ImageRef.tryParse(rest) case final ref?) {
+      if (method == 'GET') {
+        await _serve(response, ref);
+      } else if (method == 'POST') {
+        await _put(request, ref);
+      } else {
+        response.statusCode = HttpStatus.methodNotAllowed;
+      }
+    } else {
+      response.statusCode = HttpStatus.notFound;
+    }
+    return true;
+  }
+
+  DufsLogin? _login() => readDufsLoginEnv(File(loginEnvPath));
+
+  Future<void> _serve(HttpResponse response, ImageRef ref) async {
+    final file = store.fileFor(ref);
+    if (!file.existsSync()) {
+      response.statusCode = HttpStatus.notFound;
+      return;
+    }
+    response.headers
+      ..contentType = ContentType('image', 'jpeg')
+      // The name is a fresh uuid per image, so the bytes never change.
+      ..set(HttpHeaders.cacheControlHeader, 'private, max-age=31536000');
+    await response.addStream(file.openRead());
+  }
+
+  Future<void> _put(HttpRequest request, ImageRef ref) async {
+    final builder = BytesBuilder(copy: false);
+    var tooLarge = false;
+    // Read to the end even once over the cap: answering while the browser
+    // is still sending makes it see a dropped connection, not the 413.
+    await for (final chunk in request) {
+      tooLarge =
+          tooLarge || builder.length + chunk.length > kMaxImageUploadBytes;
+      if (!tooLarge) builder.add(chunk);
+    }
+    if (tooLarge) {
+      request.response.statusCode = HttpStatus.requestEntityTooLarge;
+      return;
+    }
+    final jpeg = await _prepare(builder.takeBytes());
+    if (jpeg == null) {
+      request.response.statusCode = HttpStatus.unsupportedMediaType;
+      return;
+    }
+    await store.put(ref, jpeg);
+    request.response.statusCode = HttpStatus.noContent;
+  }
+
+  Future<void> _reconcile(HttpRequest request) async {
+    final Set<ImageRef> refs;
+    try {
+      final body = jsonDecode(await utf8.decodeStream(request));
+      refs = {
+        for (final raw in (body as Map<String, dynamic>)['refs'] as List)
+          ?ImageRef.tryParse(raw as String),
+      };
+    } on Object {
+      request.response.statusCode = HttpStatus.badRequest;
+      return;
+    }
+    final login = _login();
+    final client = login == null
+        ? null
+        : DufsImageClient(login, httpClient: _httpClient());
+    try {
+      _json(request.response, (await store.reconcile(refs, client)).toJson());
+    } finally {
+      client?.close();
+    }
+  }
+
+  void _json(HttpResponse response, Object body) {
+    response.headers.contentType = ContentType.json;
+    response.write(jsonEncode(body));
+  }
+}

lib/desktop/wrapper_paths.dart

@@ -0,0 +1,25 @@
+/// Default on-disk locations the desktop wrapper reads and writes.
+///
+/// Split out of `wrapper_server.dart` (file-length cap); re-exported from
+/// there, so callers keep importing the server.
+library;
+
+import 'package:path/path.dart' as p;
+
+/// The canonical backlog file for [home], i.e. `~/src/todo/BACKLOG.md`.
+///
+/// Lives here rather than in `bin/todo_desktop.dart` so it is covered: the
+/// entry point is `coverage:ignore-file` thin wiring, and this path silently
+/// broke once already. The 2026-09-11 `~` reorganisation moved every repo
+/// under `~/src`, but the migration's rewriter only matched *literal*
+/// `/home/kuhy/todo` strings — a path assembled from segments was invisible
+/// to it, so the wrapper went on exporting to the dead `~/todo` while the
+/// `todo` MCP read `~/src/todo`. Every backlog read between 2026-09-11 and
+/// 2026-09-12 got a stale file.
+String defaultBacklogPath(String home) =>
+    p.join(home, 'src', 'todo', 'BACKLOG.md');
+
+/// The wrapper's image cache and upload queue,
+/// `~/.local/share/todo-desktop/images` — beside the note-log copy.
+String defaultImageCachePath(String home) =>
+    p.join(home, '.local', 'share', 'todo-desktop', 'images');

lib/desktop/wrapper_server.dart

@@ -5,6 +5,10 @@ import 'dart:io';
 import 'package:crdt_sync/crdt_sync.dart';
 import 'package:path/path.dart' as p;
 
+import 'package:todo/desktop/wrapper_image_routes.dart';
+
+export 'wrapper_paths.dart';
+
 part 'wrapper_sync_routes.dart';
 
 /// Route serving `todo`'s own seeded Firebase session (a `FirebaseCredentials`
@@ -16,19 +20,6 @@ part 'wrapper_sync_routes.dart';
 /// [kSyncAccountEnvVar] as [kSyncAccountPath].
 const kSyncCredentialsPath = '/sync-credentials';
 
-/// The canonical backlog file for [home], i.e. `~/src/todo/BACKLOG.md`.
-///
-/// Lives here rather than in `bin/todo_desktop.dart` so it is covered: the
-/// entry point is `coverage:ignore-file` thin wiring, and this path silently
-/// broke once already. The 2026-09-11 `~` reorganisation moved every repo
-/// under `~/src`, but the migration's rewriter only matched *literal*
-/// `/home/kuhy/todo` strings — a path assembled from segments was invisible
-/// to it, so the wrapper went on exporting to the dead `~/todo` while the
-/// `todo` MCP read `~/src/todo`. Every backlog read between 2026-09-11 and
-/// 2026-09-12 got a stale file.
-String defaultBacklogPath(String home) =>
-    p.join(home, 'src', 'todo', 'BACKLOG.md');
-
 /// Local HTTP server backing the desktop app.
 ///
 /// The desktop app is a Flutter **web** build (Flutter's Linux embedder manages
@@ -55,7 +46,11 @@ class WrapperServer {
     bool? serveSyncAccount,
     String? syncConfigDir,
     String? todoCredentialsPath,
-  }) : serveSyncAccount =
+    WrapperImageRoutes? images,
+  }) : images =
+           images ??
+           defaultWrapperImageRoutes(Platform.environment['HOME'] ?? ''),
+       serveSyncAccount =
            serveSyncAccount ??
            (Platform.environment[kSyncAccountEnvVar] ?? '').isNotEmpty,
        syncConfigDir =
@@ -70,6 +65,9 @@ class WrapperServer {
              'firebase_auth.json',
            );
 
+  /// The `/images/*` routes (attached images; see [WrapperImageRoutes]).
+  final WrapperImageRoutes images;
+
   /// Whether the sync-account route answers; off unless explicitly enabled.
   final bool serveSyncAccount;
 
@@ -152,6 +150,7 @@ class WrapperServer {
     if (path == kSyncCredentialsPath) {
       return await _syncCredentials(request);
     }
+    if (await images.handle(request)) return;
     return await _static(request, path);
   }
 
@@ -219,6 +218,8 @@ class WrapperServer {
         return ContentType('text', 'css', charset: 'utf-8');
       case '.png':
         return ContentType('image', 'png');
+      case '.jpg' || '.jpeg':
+        return ContentType('image', 'jpeg');
       case '.svg':
         return ContentType('image', 'svg+xml');
       case '.ttf':

lib/images/dufs_image_client.dart

@@ -0,0 +1,114 @@
+/// The three WebDAV calls image sync needs, against kuhy's dufs.
+///
+/// Deliberately not dufs-cloud's full `DufsClient` (~700 lines with listing,
+/// moves, streaming progress and an xml parser): todo only ever puts, gets and
+/// checks one folder. dufs creates missing parent folders on PUT (verified
+/// against dufs 0.46.0), so there is no MKCOL step.
+///
+/// Pure Dart: the desktop wrapper imports it.
+library;
+
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:http/http.dart' as http;
+
+import 'package:todo/images/image_ref.dart';
+
+/// A scoped dufs login, e.g. `todo` → `/todo-images`.
+class DufsLogin {
+  /// Creates a login for [user] with [password] against [baseUrl].
+  const DufsLogin({
+    required this.user,
+    required this.password,
+    this.baseUrl = kDufsBaseUrl,
+  });
+
+  /// The login name (`add_dufs_login.sh`'s first argument).
+  final String user;
+
+  /// Its generated password.
+  final String password;
+
+  /// The dufs origin, without a trailing slash.
+  final String baseUrl;
+}
+
+/// Outcome of [DufsImageClient.check], for the settings screen.
+enum DufsCheck {
+  /// The login can see its folder.
+  ok,
+
+  /// dufs refused the login (401/403).
+  rejected,
+
+  /// dufs answered something else, or could not be reached.
+  unreachable,
+}
+
+/// Upload / download / check for images under [kImagesDir].
+class DufsImageClient {
+  /// Creates a client for [login]; [httpClient] is injectable for tests.
+  DufsImageClient(this.login, {http.Client? httpClient})
+    : _http = httpClient ?? http.Client();
+
+  /// The credentials every request carries.
+  final DufsLogin login;
+
+  final http.Client _http;
+
+  Map<String, String> get _auth {
+    final pair = utf8.encode('${login.user}:${login.password}');
+    return {'authorization': 'Basic ${base64.encode(pair)}'};
+  }
+
+  Uri _uri(String relative) =>
+      Uri.parse('${login.baseUrl}/$kImagesDir/$relative');
+
+  /// PUTs [bytes] as [ref]; true on a 2xx.
+  Future<bool> upload(ImageRef ref, Uint8List bytes) async {
+    try {
+      final response = await _http.put(
+        _uri(ref.relativePath),
+        headers: {..._auth, 'content-type': 'image/jpeg'},
+        body: bytes,
+      );
+      return response.statusCode >= 200 && response.statusCode < 300;
+    } on Exception {
+      return false;
+    }
+  }
+
+  /// GETs [ref]'s bytes, or null when it is missing or unreachable.
+  Future<Uint8List?> download(ImageRef ref) async {
+    try {
+      final response = await _http.get(
+        _uri(ref.relativePath),
+        headers: _auth,
+      );
+      return response.statusCode == 200 ? response.bodyBytes : null;
+    } on Exception {
+      return null;
+    }
+  }
+
+  /// Whether the login can see its folder (PROPFIND, depth 0).
+  Future<DufsCheck> check() async {
+    try {
+      final request = http.Request('PROPFIND', _uri(''))
+        ..headers.addAll({..._auth, 'depth': '0'});
+      final response = await _http.send(request);
+      await response.stream.drain<void>();
+      return switch (response.statusCode) {
+        207 => DufsCheck.ok,
+        401 || 403 => DufsCheck.rejected,
+        _ => DufsCheck.unreachable,
+      };
+    } on Exception {
+      return DufsCheck.unreachable;
+    }
+  }
+
+  /// Releases the underlying HTTP client.
+  void close() => _http.close();
+}

lib/images/image_cache_store.dart

@@ -0,0 +1,207 @@
+/// The on-device copy of every image a note links to, plus the upload queue.
+///
+/// One directory, `<root>/<noteId>/<uuid>.jpg`, mirrors dufs' `todo-images/`.
+/// An image attached while offline gets a `<uuid>.jpg.pending` marker next to
+/// it; the marker is the queue, so it survives restarts with no separate
+/// bookkeeping, and it is only removed after dufs has accepted the upload.
+///
+/// Used as-is by the Android app and by the desktop wrapper (the web page
+/// never talks to dufs). Pure Dart + `dart:io`.
+library;
+
+import 'dart:async';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:path/path.dart' as p;
+
+import 'package:todo/images/dufs_image_client.dart';
+import 'package:todo/images/image_ref.dart';
+
+/// How long a cached, unreferenced image is kept before eviction.
+///
+/// Covers the gap between writing an image and its link reaching the note
+/// store (and, on desktop, the page's next reconcile): without it a
+/// reconcile landing in that gap would delete a fresh image.
+const kEvictionGrace = Duration(minutes: 10);
+
+/// Counts from one [ImageCacheStore.reconcile] pass.
+class ReconcileReport {
+  /// Creates a report.
+  const ReconcileReport({
+    this.uploaded = 0,
+    this.downloaded = 0,
+    this.evicted = 0,
+    this.pending = 0,
+    this.missing = 0,
+  });
+
+  /// Queued images dufs accepted this pass.
+  final int uploaded;
+
+  /// Linked images fetched from dufs this pass.
+  final int downloaded;
+
+  /// Unlinked cached images deleted.
+  final int evicted;
+
+  /// Images still waiting to upload after the pass.
+  final int pending;
+
+  /// Linked images still not on this device after the pass.
+  final int missing;
+
+  /// JSON form, for the wrapper's `/images/reconcile` response.
+  Map<String, int> toJson() => {
+    'uploaded': uploaded,
+    'downloaded': downloaded,
+    'evicted': evicted,
+    'pending': pending,
+    'missing': missing,
+  };
+}
+
+/// Local image files and their upload queue under [root].
+class ImageCacheStore {
+  /// Creates a store rooted at [root]; [now] is injectable for tests.
+  ImageCacheStore(this.root, {DateTime Function()? now})
+    : _now = now ?? DateTime.now;
+
+  /// Directory holding `<noteId>/<uuid>.jpg`.
+  final Directory root;
+
+  final DateTime Function() _now;
+
+  // Passes run one at a time. Calls arriving before the next pass starts
+  // merge into it (see [reconcile]).
+  Future<void> _tail = Future.value();
+  Future<ReconcileReport>? _scheduled;
+  _Pass? _scheduledPass;
+
+  /// The cached file for [ref] (it may not exist).
+  File fileFor(ImageRef ref) => File(p.join(root.path, ref.noteId, ref.file));
+
+  File _marker(ImageRef ref) => File('${fileFor(ref).path}.pending');
+
+  /// Whether [ref] is waiting to upload.
+  bool isPending(ImageRef ref) => _marker(ref).existsSync();
+
+  /// Stores [bytes] as [ref] and queues it for upload.
+  Future<void> put(ImageRef ref, Uint8List bytes) async {
+    final file = fileFor(ref);
+    await file.parent.create(recursive: true);
+    // Marker first: a crash between the two writes then leaves a marker with
+    // no file (skipped by reconcile), never a file that silently never uploads.
+    await _marker(ref).writeAsString('');
+    final tmp = File('${file.path}.tmp');
+    await tmp.writeAsBytes(bytes, flush: true);
+    await tmp.rename(file.path);
+  }
+
+  /// Every image waiting to upload.
+  List<ImageRef> pending() => [
+    for (final marker in _files('.pending'))
+      ?ImageRef.tryParse(_relative(marker).replaceFirst('.pending', '')),
+  ];
+
+  /// Uploads the queue, fetches linked images this device lacks, and evicts
+  /// cached images nothing links to any more.
+  ///
+  /// Without a [client] (no password set yet) only eviction runs. Eviction is
+  /// skipped entirely when [referenced] is empty — an empty set far more
+  /// likely means "notes not loaded yet" than "every image unlinked" — and it
+  /// never touches a queued image or one younger than [kEvictionGrace].
+  ///
+  /// Overlapping calls do not run in parallel: calls made before the next
+  /// pass starts share it, with their refs unioned and the newest client.
+  Future<ReconcileReport> reconcile(
+    Set<ImageRef> referenced,
+    DufsImageClient? client,
+  ) {
+    // Merge into a pass that has not started yet: union the refs (an
+    // upload-only call right after an attach must not wipe a full pass's
+    // refs) and keep the newest client.
+    final waiting = _scheduledPass;
+    _scheduledPass = waiting == null
+        ? _Pass(referenced, client)
+        : _Pass({
+            ...waiting.referenced,
+            ...referenced,
+          }, client ?? waiting.client);
+    final scheduled = _scheduled;
+    if (scheduled != null) return scheduled;
+    final future = _tail.then((_) {
+      final pass = _scheduledPass!;
+      _scheduledPass = null;
+      _scheduled = null;
+      return _run(pass);
+    });
+    _scheduled = future;
+    _tail = future.then<void>((_) {}, onError: (Object _) {});
+    return future;
+  }
+
+  Future<ReconcileReport> _run(_Pass pass) async {
+    var uploaded = 0;
+    var downloaded = 0;
+    final client = pass.client;
+    if (client != null) {
+      for (final ref in pending()) {
+        final file = fileFor(ref);
+        if (!file.existsSync()) continue;
+        if (await client.upload(ref, await file.readAsBytes())) {
+          await _marker(ref).delete();
+          uploaded++;
+        }
+      }
+      for (final ref in pass.referenced) {
+        if (fileFor(ref).existsSync()) continue;
+        final bytes = await client.download(ref);
+        if (bytes == null) continue;
+        final file = fileFor(ref);
+        await file.parent.create(recursive: true);
+        await file.writeAsBytes(bytes, flush: true);
+        downloaded++;
+      }
+    }
+    final evicted = pass.referenced.isEmpty ? 0 : _evict(pass.referenced);
+    return ReconcileReport(
+      uploaded: uploaded,
+      downloaded: downloaded,
+      evicted: evicted,
+      pending: pending().length,
+      missing: pass.referenced.where((r) => !fileFor(r).existsSync()).length,
+    );
+  }
+
+  int _evict(Set<ImageRef> referenced) {
+    final cutoff = _now().subtract(kEvictionGrace);
+    var evicted = 0;
+    for (final file in _files('.jpg')) {
+      final ref = ImageRef.tryParse(_relative(file));
+      if (ref == null || referenced.contains(ref) || isPending(ref)) continue;
+      if (file.lastModifiedSync().isAfter(cutoff)) continue;
+      file.deleteSync();
+      evicted++;
+    }
+    return evicted;
+  }
+
+  List<File> _files(String suffix) {
+    if (!root.existsSync()) return const [];
+    return [
+      for (final entity in root.listSync(recursive: true))
+        if (entity is File && entity.path.endsWith(suffix)) entity,
+    ];
+  }
+
+  String _relative(File file) =>
+      p.split(p.relative(file.path, from: root.path)).join('/');
+}
+
+class _Pass {
+  const _Pass(this.referenced, this.client);
+
+  final Set<ImageRef> referenced;
+  final DufsImageClient? client;
+}

lib/images/image_processing.dart

@@ -0,0 +1,66 @@
+/// Shrinks a picked or pasted image to what a note needs, before it is stored
+/// or uploaded.
+///
+/// Phone photos are 3–8 MB with GPS coordinates in their EXIF. Every image is
+/// re-encoded here: the recorded rotation is applied to the pixels first (so
+/// dropping EXIF does not leave a portrait photo lying on its side), the long
+/// side is capped at [kMaxImageSide], and the result is a JPEG with no
+/// metadata at all.
+///
+/// Pure Dart (`package:image`), so the Android app and the desktop wrapper
+/// run the same code; the web page never decodes images, it hands the raw
+/// bytes to the wrapper.
+library;
+
+import 'dart:isolate';
+import 'dart:math' as math;
+import 'dart:typed_data';
+
+import 'package:image/image.dart' as img;
+
+/// Longest side, in pixels, of a stored image.
+const kMaxImageSide = 2560;
+
+/// JPEG quality of a stored image.
+const kJpegQuality = 85;
+
+/// Re-encodes [bytes] as a metadata-free JPEG no larger than [kMaxImageSide]
+/// on its long side, or returns null when [bytes] is not a decodable image.
+Uint8List? prepareImage(Uint8List bytes) {
+  final decoded = _decode(bytes);
+  if (decoded == null) return null;
+  var image = img.bakeOrientation(decoded);
+  final longSide = math.max(image.width, image.height);
+  if (longSide > kMaxImageSide) {
+    image = image.width >= image.height
+        ? img.copyResize(image, width: kMaxImageSide)
+        : img.copyResize(image, height: kMaxImageSide);
+  }
+  if (image.hasAlpha) image = _flattenOntoWhite(image);
+  image.exif = img.ExifData();
+  return img.encodeJpg(image, quality: kJpegQuality);
+}
+
+/// [prepareImage] off the calling isolate: decoding a 12 MP photo takes long
+/// enough to drop frames if it runs on the UI isolate.
+Future<Uint8List?> prepareImageInBackground(Uint8List bytes) =>
+    Isolate.run(() => prepareImage(bytes));
+
+/// `decodeImage` returns null for most non-images but *throws* (a
+/// RangeError from its PSD sniffer, seen on a 3-byte input) for others; both
+/// mean "not an image" here.
+img.Image? _decode(Uint8List bytes) {
+  try {
+    return img.decodeImage(bytes);
+  } on Object {
+    return null;
+  }
+}
+
+/// JPEG has no alpha: without this a transparent screenshot's clear pixels
+/// come out as whatever colour their RGB happened to hold, usually black.
+img.Image _flattenOntoWhite(img.Image image) {
+  final background = img.Image(width: image.width, height: image.height)
+    ..clear(img.ColorRgb8(255, 255, 255));
+  return img.compositeImage(background, image);
+}

lib/images/image_ref.dart

@@ -0,0 +1,91 @@
+/// Where a note's image lives, and how a note's text points at it.
+///
+/// A note never stores image bytes: it carries a plain markdown link
+/// `![](https://kuhy-cloud.duckdns.org/todo-images/<noteId>/<uuid>.jpg)`, so the
+/// CRDT log, the sync format and every older build stay untouched (an old
+/// build just shows the link as text). This file is the single source of truth
+/// for that link's shape; everything else goes through it.
+///
+/// Pure Dart: the desktop wrapper (`bin/todo_desktop.dart`) imports it.
+library;
+
+import 'package:uuid/uuid.dart';
+
+/// Public origin of kuhy's dufs server (Caddy → dufs on 127.0.0.1:5000).
+const kDufsBaseUrl = 'https://kuhy-cloud.duckdns.org';
+
+/// The dufs folder the `todo` login is scoped to.
+const kImagesDir = 'todo-images';
+
+/// Where the same folder sits on kuhy's PC, as written into `BACKLOG.md` so an
+/// agent reading the backlog can open the image straight from disk.
+const kBacklogImagesRoot = '~/data/cloud/$kImagesDir';
+
+// Segments are restricted to URL- and filesystem-safe characters, which is
+// what makes a ref safe to join onto a cache directory without a traversal
+// check of its own.
+const _segment = '[A-Za-z0-9_-]+';
+const _path = '$_segment/$_segment\\.jpg';
+const _label = r'!\[[^\]\n]*\]\(';
+final _refPath = RegExp('^($_segment)/($_segment\\.jpg)\$');
+final _urlLink = RegExp(
+  '$_label${RegExp.escape('$kDufsBaseUrl/$kImagesDir/')}($_path)\\)',
+);
+final _backlogLink = RegExp(
+  '($_label)${RegExp.escape('$kBacklogImagesRoot/')}($_path\\))',
+);
+final _wholeLine = RegExp('^\\s*${_urlLink.pattern}\\s*\$');
+
+/// One image, addressed as `<noteId>/<file>` under [kImagesDir].
+///
+/// An extension type over that relative path: equality and hashing are the
+/// string's, so refs drop straight into sets.
+extension type const ImageRef._(String relativePath) {
+  /// A new, unique ref for an image being attached to [noteId].
+  factory ImageRef.create(String noteId) {
+    final ref = ImageRef.tryParse('$noteId/${const Uuid().v4()}.jpg');
+    if (ref == null) throw ArgumentError.value(noteId, 'noteId');
+    return ref;
+  }
+
+  /// Parses `<noteId>/<file>.jpg`, or null when it is not a safe image path.
+  static ImageRef? tryParse(String relativePath) =>
+      _refPath.hasMatch(relativePath) ? ImageRef._(relativePath) : null;
+
+  /// The note the image was attached to (it names the folder only).
+  String get noteId => relativePath.substring(0, relativePath.indexOf('/'));
+
+  /// `<uuid>.jpg`.
+  String get file => relativePath.substring(relativePath.indexOf('/') + 1);
+
+  /// The public dufs URL stored in the note.
+  String get url => '$kDufsBaseUrl/$kImagesDir/$relativePath';
+
+  /// The markdown line inserted into a note.
+  String get markdown => '![]($url)';
+}
+
+/// Every image [text] links to, in order, without duplicates.
+Set<ImageRef> imageRefsIn(String text) => {
+  for (final match in _urlLink.allMatches(text))
+    ImageRef.tryParse(match.group(1)!)!,
+};
+
+/// The image when [line] is nothing but one image link, else null.
+ImageRef? imageRefOfLine(String line) {
+  final match = _wholeLine.firstMatch(line);
+  return match == null ? null : ImageRef.tryParse(match.group(1)!);
+}
+
+/// Rewrites image links to their on-disk path under [kBacklogImagesRoot].
+String toBacklogImagePaths(String text) => text.replaceAllMapped(
+  _urlLink,
+  (m) => m[0]!.replaceFirst('$kDufsBaseUrl/$kImagesDir', kBacklogImagesRoot),
+);
+
+/// Exact inverse of [toBacklogImagePaths], so an exported backlog imports
+/// back with its links intact.
+String fromBacklogImagePaths(String text) => text.replaceAllMapped(
+  _backlogLink,
+  (m) => '${m[1]}$kDufsBaseUrl/$kImagesDir/${m[2]}',
+);

lib/main.dart

@@ -4,6 +4,8 @@
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:todo/analytics/analytics_service.dart';
+import 'package:todo/attachments/image_store.dart';
+import 'package:todo/attachments/image_store_scope.dart';
 import 'package:todo/data/app_settings.dart';
 import 'package:todo/data/note_repository.dart';
 import 'package:todo/data/repository_factory.dart';
@@ -20,12 +22,15 @@ Future<void> main() async {
   final repository = await openRepository();
   final appSettings = ValueNotifier(await AppSettings.load());
   final analytics = AnalyticsService(nodeId: repository.nodeId);
+  // App storage + direct dufs on Android; the wrapper's /images on desktop.
+  final imageStore = await openImageStore();
 
   runApp(
     TodoApp(
       repository: repository,
       appSettings: appSettings,
       analytics: analytics,
+      imageStore: imageStore,
     ),
   );
 }
@@ -39,6 +44,7 @@ class TodoApp extends StatelessWidget {
     required this.repository,
     required this.appSettings,
     required this.analytics,
+    required this.imageStore,
     super.key,
   });
 
@@ -53,16 +59,23 @@ class TodoApp extends StatelessWidget {
   /// reports interaction events.
   final AnalyticsService analytics;
 
+  /// The single, app-wide store for attached images.
+  final ImageStore imageStore;
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
+    // Above MaterialApp so pushed routes (note detail) see it too.
-      title: 'todo',
+    return ImageStoreScope(
-      theme: buildLightTheme(),
+      store: imageStore,
-      darkTheme: buildDarkTheme(),
+      child: MaterialApp(
-      home: CaptureScreen(
+        title: 'todo',
-        repository: repository,
+        theme: buildLightTheme(),
-        appSettings: appSettings,
+        darkTheme: buildDarkTheme(),
-        analytics: analytics,
+        home: CaptureScreen(
+          repository: repository,
+          appSettings: appSettings,
+          analytics: analytics,
+        ),
       ),
     );
   }

lib/sync/backlog_export_web.dart

@@ -5,7 +5,7 @@ import 'package:todo/sync/desktop_wrapper.dart';
 /// Export still lands at the canonical `~/src/todo/BACKLOG.md` path the user's
 /// tooling reads — the browser itself cannot write there.
 Future<String> exportBacklog(String markdown, int noteCount) async {
-  final client = DesktopBackupClient(baseUrl: desktopWrapperOrigin);
+  final client = DesktopBackupClient(baseUrl: servingWrapperOrigin());
   await client.writeBacklog(markdown);
   return 'Exported $noteCount notes to ~/src/todo/BACKLOG.md';
 }

lib/sync/desktop_wrapper.dart

@@ -9,3 +9,19 @@ const desktopWrapperPort = 8730;
 
 /// Origin of the desktop wrapper, e.g. `http://localhost:8730`.
 const desktopWrapperOrigin = 'http://localhost:$desktopWrapperPort';
+
+/// Origin of the wrapper that served this page.
+///
+/// In the real app that is always [desktopWrapperOrigin]; a test wrapper on
+/// another port then talks only to *itself*. With the hard-coded origin a
+/// test page on :8731 would POST its backlog to the real wrapper on :8730 --
+/// a CORS "simple request" the browser sends without a preflight -- and
+/// overwrite the real `BACKLOG.md`. Off the web (unit tests: `file:` base)
+/// it falls back to [desktopWrapperOrigin].
+/// [pageUrl] defaults to the page's own URL; tests pass one.
+String servingWrapperOrigin([Uri? pageUrl]) {
+  final base = pageUrl ?? Uri.base;
+  return base.scheme == 'http' || base.scheme == 'https'
+      ? base.origin
+      : desktopWrapperOrigin;
+}

lib/sync/local_backup_factory_web.dart

@@ -10,7 +10,7 @@ import 'package:todo/sync/local_backup.dart';
 /// tooling and the `todo` MCP server read it, and without this the move to a
 /// web build would let it silently go stale.
 LocalBackup createLocalBackup(NoteRepository repository) {
-  final client = DesktopBackupClient(baseUrl: desktopWrapperOrigin);
+  final client = DesktopBackupClient(baseUrl: servingWrapperOrigin());
   return LocalBackup(
     fetch: repository.listNotes,
     // Recovery reads the same file back through the wrapper, so a cleared

lib/sync/notes_markdown.dart

@@ -1,4 +1,5 @@
 import 'package:todo/data/note.dart';
+import 'package:todo/images/image_ref.dart';
 import 'package:uuid/uuid.dart';
 
 /// Serialises notes to (and parses them back from) a single Markdown file.
@@ -9,6 +10,11 @@ import 'package:uuid/uuid.dart';
 /// lets [NoteRepository.importNotes] re-import a file as a *merge* (by id)
 /// rather than creating duplicates — the basis for "never lose ideas"
 /// recovery and round-tripping a backup.
+///
+/// Attached-image links are written as their on-disk path on kuhy's PC
+/// (`~/data/cloud/todo-images/…`) so an agent reading `BACKLOG.md` can open
+/// the picture directly; [parse] turns them back into the dufs URL, so a
+/// backup still round-trips exactly.
 class NotesMarkdown {
   // Private ctor: this is a static-only utility class, never instantiated.
   const NotesMarkdown._(); // coverage:ignore-line
@@ -41,7 +47,7 @@ class NotesMarkdown {
           'created="${note.createdAt.toIso8601String()}" '
           'updated="${note.updatedAt.toIso8601String()}" -->',
         )
-        ..writeln(note.text)
+        ..writeln(toBacklogImagePaths(note.text))
         ..writeln();
     }
     return buffer.toString();
@@ -62,7 +68,9 @@ class NotesMarkdown {
       final bodyEnd = i + 1 < markers.length
           ? markers[i + 1].start
           : content.length;
-      final body = content.substring(bodyStart, bodyEnd).trim();
+      final body = fromBacklogImagePaths(
+        content.substring(bodyStart, bodyEnd).trim(),
+      );
 
       final id = attrs['id'];
       notes.add(

lib/ui/capture_app_bar.dart

@@ -4,10 +4,13 @@
 /// screen still owns every action; this just lays the row out.
 library;
 
+import 'dart:typed_data';
+
 import 'package:flutter/material.dart';
 
 import 'package:todo/data/note_repository.dart';
 import 'package:todo/frame_stats.dart';
+import 'package:todo/ui/image_picking.dart';
 
 /// App bar for the capture screen.
 class CaptureAppBar extends StatelessWidget implements PreferredSizeWidget {
@@ -20,6 +23,8 @@ class CaptureAppBar extends StatelessWidget implements PreferredSizeWidget {
     required this.onSync,
     required this.onOpenList,
     required this.onOpenSettings,
+    required this.onAttachImages,
+    this.imagePicking,
     super.key,
   });
 
@@ -44,6 +49,12 @@ class CaptureAppBar extends StatelessWidget implements PreferredSizeWidget {
   /// Opens the settings screen.
   final VoidCallback onOpenSettings;
 
+  /// Receives images picked with the 📎 action.
+  final ValueChanged<List<Uint8List>> onAttachImages;
+
+  /// The picker behind 📎; null uses the platform one.
+  final ImagePicking? imagePicking;
+
   @override
   Size get preferredSize => const Size.fromHeight(kToolbarHeight);
 
@@ -68,6 +79,8 @@ class CaptureAppBar extends StatelessWidget implements PreferredSizeWidget {
             ),
           ),
         // coverage:ignore-end
+        // Not gated on advanced mode: attaching is basic capture.
+        AttachImageButton(onImages: onAttachImages, picking: imagePicking),
         IconButton(
           tooltip: 'New note',
           onPressed: onNewNote,

lib/ui/capture_draft.dart

@@ -34,6 +34,10 @@ class CaptureDraft {
   String? _id;
   DateTime? _createdAt;
 
+  /// Whether [_id] was handed out by [reserveId] and no write has used it
+  /// yet, so the first write still reports the note as created.
+  bool _reserved = false;
+
   /// The draft's priority, applied to every write.
   Priority priority = Priority.defaultValue;
 
@@ -54,17 +58,33 @@ class CaptureDraft {
       _id = _uuid.v4();
       _createdAt = DateTime.now();
       created = true;
+    } else if (_reserved) {
+      if (text.trim().isEmpty) return false;
+      _reserved = false;
+      created = true;
     }
     await _save(live: live);
     return created;
   }
 
+  /// The draft's note id, reserving one (without saving anything) when the
+  /// draft has none yet: an attached image is filed under its note's id
+  /// before the link that creates the note is inserted.
+  String reserveId() {
+    if (_id == null) {
+      _id = _uuid.v4();
+      _createdAt = DateTime.now();
+      _reserved = true;
+    }
+    return _id!;
+  }
+
   /// Re-saves when only priority/status changed.
   ///
   /// Does nothing before the row exists: the new value is already held here
   /// and will be applied by the first keystroke that creates it.
   Future<void> persistMetadata({required bool Function() live}) async {
-    if (_id == null) return;
+    if (_id == null || _reserved) return;
     await _save(live: live);
   }
 
@@ -91,6 +111,7 @@ class CaptureDraft {
     _text = '';
     _id = null;
     _createdAt = null;
+    _reserved = false;
     priority = Priority.defaultValue;
     status = Status.todo;
     lastSavedAt.value = null;

lib/ui/capture_screen.dart

@@ -1,10 +1,12 @@
 import 'dart:async';
+import 'dart:typed_data';
 import 'package:crdt_sync/crdt_sync.dart';
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:http/http.dart' as http;
 import 'package:todo/analytics/analytics_event.dart';
 import 'package:todo/analytics/analytics_service.dart';
+import 'package:todo/attachments/image_store_scope.dart';
 import 'package:todo/data/app_settings.dart';
 import 'package:todo/data/note.dart';
 import 'package:todo/data/note_repository.dart';
@@ -17,10 +19,14 @@ import 'package:todo/ui/capture_draft.dart';
 import 'package:todo/ui/capture_status.dart';
 import 'package:todo/ui/capture_status_footer.dart';
 import 'package:todo/ui/capture_sync_runner.dart';
+import 'package:todo/ui/image_attach.dart';
+import 'package:todo/ui/image_input.dart';
+import 'package:todo/ui/image_picking.dart';
 import 'package:todo/ui/note_form.dart';
 import 'package:todo/ui/notes_list_screen.dart';
 import 'package:todo/ui/settings_screen.dart';
 
+part 'capture_screen_images.dart';
 part 'capture_screen_sync.dart';
 part 'capture_screen_widget.dart';
 
@@ -59,6 +65,9 @@ class _CaptureScreenState extends State<CaptureScreen>
   /// The note being captured, and its write-through to storage.
   late final CaptureDraft _draft = CaptureDraft(widget.repository);
 
+  /// Inserts attached-image links into the mounted editor.
+  final ImageAttachController _attach = ImageAttachController();
+
   final SyncStatusStore _syncStatus = SyncStatusStore();
 
   /// Runs sync passes and records their outcome; see [CaptureSyncRunner].
@@ -138,6 +147,8 @@ class _CaptureScreenState extends State<CaptureScreen>
             onSync: _sync,
             onOpenList: _openList,
             onOpenSettings: _openSettings,
+            onAttachImages: _attachImages,
+            imagePicking: widget.imagePicking,
           ),
           body: _captureBody(advanced: advanced),
         );
@@ -167,33 +178,11 @@ class _CaptureScreenState extends State<CaptureScreen>
       // flicker doesn't fire a request per focus change.
       _autoSyncDebounce?.cancel();
       _autoSyncDebounce = Timer(CaptureScreen.autoSyncDebounce, _autoSync);
+    } else if (state == AppLifecycleState.resumed) {
+      unawaited(_reconcileImages());
     }
   }
 
-  /// Opens the settings screen and adopts any saved configuration.
-  Future<void> _openSettings() async {
-    _logEvent('screen_view', params: {'screen': 'settings'});
-    final current = _settings ?? await SyncSettings.load();
-    if (!mounted) return;
-    await Navigator.of(context).push<SyncSettings>(
-      MaterialPageRoute(
-        builder: (_) => SettingsScreen(
-          initial: current,
-          repository: widget.repository,
-          appSettings: widget.appSettings,
-          analytics: widget.analytics,
-          httpClient: widget.httpClient,
-        ),
-      ),
-    );
-    if (!mounted) return;
-    // Always reload from storage: a device-flow "Connect" saves the token
-    // without popping a result, so relying on the pop value would miss it and
-    // leave us syncing with stale (token-less) settings.
-    final fresh = await SyncSettings.load();
-    setState(() => _settings = fresh);
-  }
-
   /// Runs a full sync, routing to settings first if not yet configured.
   Future<void> _sync() async {
     final settings = _settings ?? await SyncSettings.load();
@@ -210,6 +199,7 @@ class _CaptureScreenState extends State<CaptureScreen>
         live: () => mounted,
       );
       if (outcome.ok) _adoptReconciledSettings(outcome.reconciled);
+      unawaited(_reconcileImages());
       _logEvent(
         'sync_result',
         params: {

lib/ui/capture_screen_images.dart

@@ -0,0 +1,29 @@
+/// The capture screen's image behaviour: attaching to the draft, and
+/// reconciling the device's image store with every note.
+///
+/// A `part` of `capture_screen.dart` because it reads the private draft and
+/// attach controller.
+part of 'capture_screen.dart';
+
+extension _CaptureImages on _CaptureScreenState {
+  /// Stores [images] under the draft's note (reserving its id) and inserts
+  /// their links at the cursor. [rejected] counts dropped non-images.
+  Future<void> _attachImages(List<Uint8List> images, {int rejected = 0}) =>
+      attachImages(
+        context,
+        noteId: _draft.reserveId,
+        target: _attach,
+        images: images,
+        rejected: rejected,
+      );
+
+  /// Uploads queued images, prefetches every image any note links to, and
+  /// evicts what no note links to. Runs after every sync attempt, on resume
+  /// and at launch (via the launch sync).
+  Future<void> _reconcileImages() async {
+    if (!mounted) return;
+    final store = ImageStoreScope.read(context);
+    final notes = await widget.repository.listNotes();
+    await store.reconcile([for (final note in notes) note.text]);
+  }
+}

lib/ui/capture_screen_sync.dart

@@ -9,10 +9,18 @@
 part of 'capture_screen.dart';
 
 extension _CaptureSyncBehaviour on _CaptureScreenState {
+  /// Background sync, then an image reconcile over the notes it produced.
+  /// The reconcile runs even when sync is skipped (unconfigured, offline):
+  /// images have their own login and must still upload and prefetch.
+  Future<void> _autoSync() async {
+    await _autoSyncPass();
+    await _reconcileImages();
+  }
+
   /// Best-effort background sync: no snackbar, skips when unconfigured, and
   /// never overlaps itself. Failures are not swallowed silently — the outcome
   /// lands in the status line so drift can't go unnoticed for days.
-  Future<void> _autoSync() async {
+  Future<void> _autoSyncPass() async {
     final settings = _settings;
     if (_autoSyncing || settings == null) return;
     // Either backend counts. `isConfigured` means "has a GitHub token", so
@@ -52,6 +60,30 @@ extension _CaptureSyncBehaviour on _CaptureScreenState {
     widget.appSettings.value = widget.appSettings.value.adopt(reconciled);
   }
 
+  /// Opens the settings screen and adopts any saved configuration.
+  Future<void> _openSettings() async {
+    _logEvent('screen_view', params: {'screen': 'settings'});
+    final current = _settings ?? await SyncSettings.load();
+    if (!mounted) return;
+    await Navigator.of(context).push<SyncSettings>(
+      MaterialPageRoute(
+        builder: (_) => SettingsScreen(
+          initial: current,
+          repository: widget.repository,
+          appSettings: widget.appSettings,
+          analytics: widget.analytics,
+          httpClient: widget.httpClient,
+        ),
+      ),
+    );
+    if (!mounted) return;
+    // Always reload from storage: a device-flow "Connect" saves the token
+    // without popping a result, so relying on the pop value would miss it and
+    // leave us syncing with stale (token-less) settings.
+    final fresh = await SyncSettings.load();
+    _rebuild(() => _settings = fresh);
+  }
+
   void _openList() {
     _logEvent('screen_view', params: {'screen': 'notes_list'});
     Navigator.of(context).push<void>(
@@ -95,8 +127,17 @@ extension _CaptureSyncBehaviour on _CaptureScreenState {
     if (recovered.isNotEmpty) await widget.repository.importNotes(recovered);
   }
 
-  /// The composer column: metadata row, editor, and status footer.
+  /// The composer column: metadata row, editor, and status footer. Images
+  /// pasted or dropped anywhere on the (desktop) page attach to the draft.
   Widget _captureBody({required bool advanced}) {
+    return ImageInputListener(
+      onImages: (images, rejected) =>
+          unawaited(_attachImages(images, rejected: rejected)),
+      child: _composer(advanced: advanced),
+    );
+  }
+
+  Widget _composer({required bool advanced}) {
     return Padding(
       padding: const EdgeInsets.all(16),
       child: Column(
@@ -120,6 +161,7 @@ extension _CaptureSyncBehaviour on _CaptureScreenState {
               onStatusChanged: _setStatus,
               autofocus: true,
               onChanged: _onChanged,
+              attachController: _attach,
             ),
           ),
           CaptureStatusFooter(

lib/ui/capture_screen_widget.dart

@@ -22,6 +22,7 @@ class CaptureScreen extends StatefulWidget {
     this.localBackup,
     this.firebaseFactory,
     this.stateStore,
+    this.imagePicking,
     super.key,
   });
 
@@ -55,6 +56,9 @@ class CaptureScreen extends StatefulWidget {
   /// file-backed instance is created); tests pass a fake with in-memory IO.
   final LocalBackup? localBackup;
 
+  /// The 📎 picker; null uses the platform one. Injected by tests.
+  final ImagePicking? imagePicking;
+
   /// How long focus must stay lost before a background sync fires. Public so
   /// tests can pump exactly past it.
   static const autoSyncDebounce = Duration(seconds: 5);

lib/ui/cloud_images_settings.dart

@@ -0,0 +1,176 @@
+/// Settings → Cloud images: the dufs login attached images upload with.
+///
+/// On the phone that is a password field (the `todo` login's password,
+/// printed and put on the PC clipboard by `add_dufs_login.sh`) plus a Test
+/// button. The desktop page has no field: its wrapper reads the login from
+/// `~/.config/dufs/logins/todo.env`, so the screen only reports whether it
+/// found one.
+library;
+
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
+
+import 'package:todo/attachments/image_password_store.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/images/dufs_image_client.dart';
+
+/// The command that creates the login, shown wherever it is missing.
+const kAddLoginCommand =
+    '~/src/dufs-cloud/scripts/add_dufs_login.sh todo /todo-images rw';
+
+/// The settings-list entry that opens [CloudImagesScreen].
+class CloudImagesTile extends StatelessWidget {
+  /// Creates the tile; [httpClient] reaches the Test button (tests).
+  const CloudImagesTile({this.httpClient, super.key});
+
+  /// Injected HTTP client for the Test button.
+  final http.Client? httpClient;
+
+  @override
+  Widget build(BuildContext context) => ListTile(
+    contentPadding: EdgeInsets.zero,
+    title: const Text('Cloud images'),
+    subtitle: const Text('Where attached images upload (dufs)'),
+    trailing: const Icon(Icons.chevron_right),
+    onTap: () => Navigator.of(context).push<void>(
+      MaterialPageRoute(
+        builder: (_) => CloudImagesScreen(httpClient: httpClient),
+      ),
+    ),
+  );
+}
+
+/// Password + status for image uploads.
+class CloudImagesScreen extends StatefulWidget {
+  /// Creates the screen; everything injectable is for tests.
+  const CloudImagesScreen({
+    this.passwords = const ImagePasswordStore(),
+    this.httpClient,
+    this.showPasswordField = !kIsWeb,
+    super.key,
+  });
+
+  /// Where the phone keeps the password.
+  final ImagePasswordStore passwords;
+
+  /// Injected HTTP client for the Test button.
+  final http.Client? httpClient;
+
+  /// Whether this device enters the password itself (not the desktop page).
+  final bool showPasswordField;
+
+  @override
+  State<CloudImagesScreen> createState() => _CloudImagesScreenState();
+}
+
+class _CloudImagesScreenState extends State<CloudImagesScreen> {
+  final _password = TextEditingController();
+  ImageStoreStatus? _status;
+  String? _checkResult;
+  bool _checking = false;
+
+  @override
+  void initState() {
+    super.initState();
+    unawaited(_load());
+  }
+
+  @override
+  void dispose() {
+    _password.dispose();
+    super.dispose();
+  }
+
+  Future<void> _load() async {
+    final store = ImageStoreScope.read(context);
+    if (widget.showPasswordField) {
+      _password.text = await widget.passwords.read();
+    }
+    final status = await store.status();
+    if (mounted) setState(() => _status = status);
+  }
+
+  /// Saves the password, then checks it against dufs.
+  Future<void> _saveAndTest() async {
+    final password = _password.text.trim();
+    setState(() => _checking = true);
+    final saved = await widget.passwords.write(password);
+    var result = 'Could not save: the keystore is unavailable';
+    if (saved) {
+      final client = DufsImageClient(
+        DufsLogin(user: kDufsImagesUser, password: password),
+        httpClient: widget.httpClient,
+      );
+      final check = await client.check();
+      result = switch (check) {
+        DufsCheck.ok => 'Saved — dufs accepted the login',
+        DufsCheck.rejected => 'Saved, but dufs rejected the password',
+        DufsCheck.unreachable => 'Saved — dufs is unreachable right now',
+      };
+      // Upload what queued up while there was no password, now rather than
+      // on the next sync. No note texts: an empty ref set only uploads, it
+      // never evicts.
+      if (check == DufsCheck.ok && mounted) {
+        await ImageStoreScope.read(context).reconcile(const []);
+      }
+    }
+    if (!mounted) return;
+    setState(() {
+      _checking = false;
+      _checkResult = result;
+    });
+    await _load();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final status = _status;
+    return Scaffold(
+      appBar: AppBar(title: const Text('Cloud images')),
+      body: ListView(
+        padding: const EdgeInsets.all(16),
+        children: [
+          if (widget.showPasswordField) ...[
+            TextField(
+              controller: _password,
+              obscureText: true,
+              decoration: const InputDecoration(
+                labelText: 'Password for the "todo" dufs login',
+              ),
+            ),
+            const SizedBox(height: 12),
+            FilledButton(
+              onPressed: _checking ? null : _saveAndTest,
+              child: const Text('Save & test'),
+            ),
+            if (_checkResult case final result?) ...[
+              const SizedBox(height: 8),
+              Text(result),
+            ],
+            const SizedBox(height: 16),
+          ],
+          if (status != null) ...[
+            Text(
+              status.configured
+                  ? 'Login: configured'
+                  : 'Login: missing — create it on the PC with',
+            ),
+            if (!status.configured) const SelectableText(kAddLoginCommand),
+            const SizedBox(height: 8),
+            Text('Waiting to upload: ${status.pending}'),
+          ],
+          const SizedBox(height: 16),
+          Text(
+            'Images are shrunk to 2560px JPEGs without location data before '
+            'they leave this device.',
+            style: Theme.of(context).textTheme.bodySmall,
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/ui/image_attach.dart

@@ -0,0 +1,81 @@
+/// Turning picked, pasted or dropped image bytes into links in the open note.
+///
+/// Shared by the capture and detail screens: each owns one
+/// [ImageAttachController], hands it to its [NoteEditor] (which binds the
+/// insert-at-cursor), and routes every image source through [attachImages].
+library;
+
+import 'dart:typed_data';
+
+import 'package:design_system/design_system.dart';
+import 'package:flutter/widgets.dart';
+
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/images/image_ref.dart';
+
+/// Lets a screen insert lines into whichever editor is currently mounted.
+class ImageAttachController {
+  void Function(List<String> lines)? _insert;
+
+  /// Called by the editor on mount with its insert-at-cursor function;
+  /// returns the call that undoes it (a no-op once another editor bound).
+  VoidCallback bind(void Function(List<String> lines) insert) {
+    _insert = insert;
+    return () {
+      if (identical(_insert, insert)) _insert = null;
+    };
+  }
+
+  /// Inserts [lines] at the editor's cursor; false when no editor is bound.
+  bool insert(List<String> lines) {
+    final insert = _insert;
+    if (insert == null || lines.isEmpty) return false;
+    insert(lines);
+    return true;
+  }
+}
+
+/// Stores each of [images] for the note [noteId] names and inserts their
+/// links, in order, through [target].
+///
+/// [noteId] is a callback because the capture screen's draft only gets an id
+/// once there is something to save; asking for it is what reserves one.
+/// Reserving writes nothing, so a rejected paste still never creates an
+/// empty note. [rejected] counts inputs already known
+/// not to be images (e.g. a dropped PDF), so one message covers both.
+Future<void> attachImages(
+  BuildContext context, {
+  required String Function() noteId,
+  required ImageAttachController target,
+  required List<Uint8List> images,
+  int rejected = 0,
+}) async {
+  final store = ImageStoreScope.read(context);
+  final refs = <ImageRef>[];
+  var notImages = rejected;
+  String? failure;
+  for (final bytes in images) {
+    try {
+      final ref = await store.attach(noteId(), bytes);
+      if (ref == null) {
+        notImages++;
+      } else {
+        refs.add(ref);
+      }
+    } on ImageStoreException catch (e) {
+      failure = e.message;
+      break;
+    }
+  }
+  target.insert([for (final ref in refs) ref.markdown]);
+  if (!context.mounted) return;
+  if (failure != null) {
+    showError(context, failure);
+  } else if (notImages > 0) {
+    showError(
+      context,
+      notImages == 1 ? 'Not an image' : '$notImages files were not images',
+    );
+  }
+}

lib/ui/image_input.dart

@@ -0,0 +1,6 @@
+/// [ImageInputListener] for the current platform: paste and drag-and-drop on
+/// the desktop web build, a pass-through elsewhere.
+library;
+
+export 'image_input_io.dart'
+    if (dart.library.js_interop) 'image_input_web.dart';

lib/ui/image_input_files.dart

@@ -0,0 +1,15 @@
+/// Which of a paste's or drop's files are images: split out of the web-only
+/// listener so the decision is unit-testable on the VM.
+library;
+
+/// Indices of the files whose MIME type is an image, and how many were not.
+///
+/// Order is preserved: files dropped together are attached in the order the
+/// browser lists them.
+({List<int> images, int rejected}) partitionImageFiles(List<String> mimeTypes) {
+  final images = <int>[
+    for (var i = 0; i < mimeTypes.length; i++)
+      if (mimeTypes[i].toLowerCase().startsWith('image/')) i,
+  ];
+  return (images: images, rejected: mimeTypes.length - images.length);
+}

lib/ui/image_input_io.dart

@@ -0,0 +1,27 @@
+import 'dart:typed_data';
+
+import 'package:flutter/widgets.dart';
+
+/// Receives pasted or dropped images and the count of non-image files.
+typedef ImageInputCallback =
+    void Function(List<Uint8List> images, int rejected);
+
+/// Off the web there is no document to paste or drop onto (Android attaches
+/// through the 📎 button), so this is just [child].
+class ImageInputListener extends StatelessWidget {
+  /// Wraps [child]; [onImages] is never called on this platform.
+  const ImageInputListener({
+    required this.onImages,
+    required this.child,
+    super.key,
+  });
+
+  /// Unused off the web.
+  final ImageInputCallback onImages;
+
+  /// The screen body.
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) => child;
+}

lib/ui/image_input_web.dart

@@ -0,0 +1,103 @@
+/// Ctrl+V and drag-and-drop of images onto the desktop (web) page.
+///
+/// Flutter web has no drop target of its own, so this listens on the DOM
+/// `document` directly (`package:web`, no native plugin): `dragover` must be
+/// cancelled for the page to accept a drop at all, and `drop` must be, or
+/// Chrome navigates away to the dropped file. A paste is only taken over when
+/// the clipboard carries files; plain-text pastes stay the text field's.
+library;
+
+import 'dart:async';
+import 'dart:js_interop';
+import 'dart:typed_data';
+
+import 'package:flutter/widgets.dart';
+import 'package:todo/ui/image_input_files.dart';
+import 'package:web/web.dart' as web;
+
+/// Receives pasted or dropped images and the count of non-image files.
+typedef ImageInputCallback =
+    void Function(List<Uint8List> images, int rejected);
+
+/// Calls [onImages] for images pasted or dropped anywhere on the page while
+/// this widget's route is the visible one.
+class ImageInputListener extends StatefulWidget {
+  /// Wraps [child], listening while mounted.
+  const ImageInputListener({
+    required this.onImages,
+    required this.child,
+    super.key,
+  });
+
+  /// Receives the image bytes in order, plus the non-image count.
+  final ImageInputCallback onImages;
+
+  /// The screen body.
+  final Widget child;
+
+  @override
+  State<ImageInputListener> createState() => _ImageInputListenerState();
+}
+
+class _ImageInputListenerState extends State<ImageInputListener> {
+  late final JSFunction _onDragOver = _dragOver.toJS;
+  late final JSFunction _onDrop = _drop.toJS;
+  late final JSFunction _onPaste = _paste.toJS;
+
+  @override
+  void initState() {
+    super.initState();
+    web.document
+      ..addEventListener('dragover', _onDragOver)
+      ..addEventListener('drop', _onDrop)
+      ..addEventListener('paste', _onPaste);
+  }
+
+  @override
+  void dispose() {
+    web.document
+      ..removeEventListener('dragover', _onDragOver)
+      ..removeEventListener('drop', _onDrop)
+      ..removeEventListener('paste', _onPaste);
+    super.dispose();
+  }
+
+  // The capture screen stays mounted under a pushed detail screen, and both
+  // listen on the same document: only the visible route may take the input,
+  // or one drop would attach to two notes.
+  bool get _active => mounted && (ModalRoute.of(context)?.isCurrent ?? true);
+
+  void _dragOver(web.DragEvent event) {
+    final types = event.dataTransfer?.types.toDart ?? const <JSString>[];
+    if (_active && types.any((t) => t.toDart == 'Files')) {
+      event.preventDefault();
+    }
+  }
+
+  void _drop(web.DragEvent event) {
+    final files = event.dataTransfer?.files;
+    if (!_active || files == null || files.length == 0) return;
+    event.preventDefault();
+    unawaited(_take(files));
+  }
+
+  void _paste(web.ClipboardEvent event) {
+    final files = event.clipboardData?.files;
+    if (!_active || files == null || files.length == 0) return;
+    event.preventDefault();
+    unawaited(_take(files));
+  }
+
+  Future<void> _take(web.FileList list) async {
+    final files = [for (var i = 0; i < list.length; i++) list.item(i)!];
+    final split = partitionImageFiles([for (final f in files) f.type]);
+    final images = <Uint8List>[
+      for (final i in split.images)
+        (await files[i].arrayBuffer().toDart).toDart.asUint8List(),
+    ];
+    if (mounted) widget.onImages(images, split.rejected);
+  }
+
+  @override
+  Widget build(BuildContext context) => widget.child;
+}

lib/ui/image_picking.dart

@@ -0,0 +1,104 @@
+/// The 📎 button: pick images from the camera or gallery (Android) or from
+/// disk (desktop), and hand their bytes on.
+library;
+
+import 'package:file_selector/file_selector.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:image_picker/image_picker.dart';
+
+/// Where the phone takes an image from.
+enum ImagePickSource {
+  /// A new photo.
+  camera,
+
+  /// Existing photos, several at once.
+  gallery,
+}
+
+/// Picks images and returns their bytes; empty when the user cancels.
+///
+/// Injectable so widget tests never reach a platform picker.
+typedef ImagePicking = Future<List<Uint8List>> Function(BuildContext context);
+
+/// The platform picker: a Camera/Gallery sheet on Android, a multi-select
+/// file dialog filtered to images on the desktop (web) build.
+///
+/// [fromPhone] is the platform call behind the sheet, injectable for tests.
+Future<List<Uint8List>> pickImages(
+  BuildContext context, {
+  Future<List<Uint8List>> Function(ImagePickSource) fromPhone = _pickFromPhone,
+}) async {
+  // The desktop build has no sheet: straight to the file dialog.
+  if (kIsWeb) return await _pickFiles(); // coverage:ignore-line
+  final source = await showModalBottomSheet<ImagePickSource>(
+    context: context,
+    builder: (context) => SafeArea(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          ListTile(
+            leading: const Icon(Icons.photo_camera_outlined),
+            title: const Text('Camera'),
+            onTap: () => Navigator.pop(context, ImagePickSource.camera),
+          ),
+          ListTile(
+            leading: const Icon(Icons.photo_library_outlined),
+            title: const Text('Gallery'),
+            onTap: () => Navigator.pop(context, ImagePickSource.gallery),
+          ),
+        ],
+      ),
+    ),
+  );
+  if (source == null) return const [];
+  return await fromPhone(source);
+}
+
+// coverage:ignore-start
+// Thin calls into platform pickers with no test binding; the sheet above and
+// everything downstream of the returned bytes are covered.
+Future<List<Uint8List>> _pickFromPhone(ImagePickSource source) async {
+  final picker = ImagePicker();
+  final files = switch (source) {
+    ImagePickSource.camera => [
+      ?await picker.pickImage(source: ImageSource.camera),
+    ],
+    ImagePickSource.gallery => await picker.pickMultiImage(),
+  };
+  return [for (final file in files) await file.readAsBytes()];
+}
+
+Future<List<Uint8List>> _pickFiles() async {
+  final files = await openFiles(
+    acceptedTypeGroups: const [
+      XTypeGroup(label: 'Images', mimeTypes: ['image/*']),
+    ],
+  );
+  return [for (final file in files) await file.readAsBytes()];
+}
+// coverage:ignore-end
+
+/// App-bar action that picks images and passes them to [onImages].
+class AttachImageButton extends StatelessWidget {
+  /// Creates the button; [picking] defaults to [pickImages].
+  const AttachImageButton({required this.onImages, this.picking, super.key});
+
+  /// Receives the picked images (never called for a cancelled pick).
+  final ValueChanged<List<Uint8List>> onImages;
+
+  /// The picker, injectable for tests.
+  final ImagePicking? picking;
+
+  @override
+  Widget build(BuildContext context) {
+    return IconButton(
+      tooltip: 'Attach image',
+      icon: const Icon(Icons.attach_file),
+      onPressed: () async {
+        final images = await (picking ?? pickImages)(context);
+        if (images.isNotEmpty) onImages(images);
+      },
+    );
+  }
+}

lib/ui/images/image_embed.dart

@@ -0,0 +1,115 @@
+/// One attached image as it appears in a note: the picture, or a placeholder
+/// saying why it is not here yet. Tapping opens it full screen.
+library;
+
+import 'package:flutter/material.dart';
+
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/ui/images/image_viewer_screen.dart';
+import 'package:todo/ui/images/local_image.dart';
+
+/// Placeholder text for an image this device does not have yet.
+const kImageNotDownloaded = 'Not downloaded yet';
+
+/// Tooltip on the badge of an image dufs has not accepted yet.
+const kImageWaitingToUpload = 'Waiting to upload';
+
+/// Renders [ref] from the nearest [ImageStoreScope].
+class ImageEmbed extends StatelessWidget {
+  /// Creates an embed; [fit] is `cover` for thumbnails, `contain` inline.
+  const ImageEmbed({
+    required this.ref,
+    this.fit = BoxFit.cover,
+    super.key,
+  });
+
+  /// The image to show.
+  final ImageRef ref;
+
+  /// How the picture fills the embed's box.
+  final BoxFit fit;
+
+  @override
+  Widget build(BuildContext context) {
+    final store = ImageStoreScope.of(context);
+    final source = store.sourceFor(ref);
+    final picture = imageFor(source, fit: fit);
+    return Semantics(
+      label: 'Attached image',
+      button: source is! MissingImageSource,
+      child: GestureDetector(
+        onTap: source is MissingImageSource
+            ? null
+            : () => Navigator.of(context).push<void>(
+                MaterialPageRoute(
+                  builder: (_) => ImageViewerScreen(source: source),
+                ),
+              ),
+        child: ClipRRect(
+          borderRadius: BorderRadius.circular(8),
+          child: Stack(
+            fit: StackFit.passthrough,
+            children: [
+              picture,
+              if (store.isPending(ref))
+                const Positioned(
+                  right: 4,
+                  top: 4,
+                  child: Tooltip(
+                    message: kImageWaitingToUpload,
+                    child: Icon(Icons.cloud_upload_outlined, size: 18),
+                  ),
+                ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+/// The picture for [source], falling back to the not-downloaded placeholder
+/// (also when a network load fails: the wrapper 404s until it has the file).
+Widget imageFor(ImageSource source, {required BoxFit fit}) {
+  Widget placeholder(BuildContext context, Object error, StackTrace? stack) =>
+      const ImagePlaceholder();
+  return switch (source) {
+    LocalImageSource(:final path) => localImage(
+      path,
+      fit: fit,
+      errorBuilder: placeholder,
+    ),
+    NetworkImageSource(:final url) => Image.network(
+      url,
+      fit: fit,
+      errorBuilder: placeholder,
+    ),
+    MissingImageSource() => const ImagePlaceholder(),
+  };
+}
+
+/// Grey box with [kImageNotDownloaded].
+class ImagePlaceholder extends StatelessWidget {
+  /// Creates the placeholder.
+  const ImagePlaceholder({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return ColoredBox(
+      color: theme.colorScheme.surfaceContainerHighest,
+      child: Center(
+        child: Padding(
+          padding: const EdgeInsets.all(8),
+          child: Text(
+            kImageNotDownloaded,
+            textAlign: TextAlign.center,
+            style: theme.textTheme.bodySmall,
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/ui/images/image_strip.dart

@@ -0,0 +1,48 @@
+import 'package:design_system/design_system.dart';
+import 'package:flutter/material.dart';
+
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/ui/images/image_embed.dart';
+
+/// Height of the thumbnail row under the editor.
+const kImageStripHeight = 88.0;
+
+/// A row of thumbnails for every image [text] links to, shown under the
+/// editing field so a note's pictures are visible while writing it. The
+/// editing modes show the links as text; without this the default (Raw)
+/// mode would never show an image at all. Empty when there are none.
+class ImageStrip extends StatelessWidget {
+  /// Creates the strip for [text].
+  const ImageStrip({required this.text, super.key});
+
+  /// The note text being edited.
+  final String text;
+
+  @override
+  Widget build(BuildContext context) {
+    final refs = imageRefsIn(text).toList();
+    if (refs.isEmpty) return const SizedBox.shrink();
+    // Same centred column as the editor above it (rule 21), so on the wide
+    // desktop window the thumbnails sit under the text, not at the far edge.
+    return Padding(
+      padding: const EdgeInsets.only(top: 8),
+      child: Center(
+        child: ConstrainedBox(
+          constraints: const BoxConstraints(
+            maxWidth: kProseMaxWidth,
+            maxHeight: kImageStripHeight,
+          ),
+          child: ListView.separated(
+            scrollDirection: Axis.horizontal,
+            itemCount: refs.length,
+            separatorBuilder: (_, _) => const SizedBox(width: 8),
+            itemBuilder: (context, i) => SizedBox(
+              width: kImageStripHeight,
+              child: ImageEmbed(ref: refs[i]),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/ui/images/image_viewer_screen.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/ui/images/image_embed.dart';
+
+/// One image, full screen, pinch/scroll to zoom.
+class ImageViewerScreen extends StatelessWidget {
+  /// Creates the viewer for [source].
+  const ImageViewerScreen({required this.source, super.key});
+
+  /// Where the image is drawn from.
+  final ImageSource source;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(),
+      body: InteractiveViewer(
+        maxScale: 8,
+        child: Center(child: imageFor(source, fit: BoxFit.contain)),
+      ),
+    );
+  }
+}

lib/ui/images/local_image.dart

@@ -0,0 +1,5 @@
+/// `Image.file` without importing `dart:io` into web code.
+library;
+
+export 'local_image_io.dart'
+    if (dart.library.js_interop) 'local_image_web.dart';

lib/ui/images/local_image_io.dart

@@ -0,0 +1,10 @@
+import 'dart:io';
+
+import 'package:flutter/widgets.dart';
+
+/// A cached image file on this device.
+Widget localImage(
+  String path, {
+  required BoxFit fit,
+  required ImageErrorWidgetBuilder errorBuilder,
+}) => Image.file(File(path), fit: fit, errorBuilder: errorBuilder);

lib/ui/images/local_image_web.dart

@@ -0,0 +1,8 @@
+import 'package:flutter/widgets.dart';
+
+/// Never reached on the web: the web store only returns network sources.
+Widget localImage(
+  String path, {
+  required BoxFit fit,
+  required ImageErrorWidgetBuilder errorBuilder,
+}) => const SizedBox.shrink();

lib/ui/markdown_view.dart

@@ -1,11 +1,18 @@
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/ui/images/image_embed.dart';
+
+/// Tallest an image is drawn inside a rendered note.
+const kInlineImageHeight = 320.0;
+
 /// A lightweight, read-only renderer for the note format.
 ///
 /// The app's notes use a small, known Markdown subset — an `#` title, `##`
 /// section headings, italic `_guidance_` lines, `-` bullet lists and plain
-/// paragraphs — so a tailored line-based renderer covers everything we emit
+/// paragraphs, plus one attached image per line (see `image_ref.dart`) — so a
+/// tailored line-based renderer covers everything we emit
 /// without pulling in a full Markdown engine. It keeps the quick-capture app
 /// lean and is trivial to test.
 ///
@@ -30,6 +37,18 @@ class MarkdownView extends StatelessWidget {
         widgets.add(const SizedBox(height: 8));
         continue;
       }
+      if (imageRefOfLine(trimmed) case final image?) {
+        widgets.add(
+          Padding(
+            padding: const EdgeInsets.symmetric(vertical: 4),
+            child: ConstrainedBox(
+              constraints: const BoxConstraints(maxHeight: kInlineImageHeight),
+              child: ImageEmbed(ref: image, fit: BoxFit.contain),
+            ),
+          ),
+        );
+        continue;
+      }
       if (trimmed.startsWith('## ')) {
         widgets.add(
           Padding(

lib/ui/note_detail_screen.dart

@@ -1,9 +1,15 @@
+import 'dart:async';
+import 'dart:typed_data';
+
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:todo/data/app_settings.dart';
 import 'package:todo/data/note.dart';
 import 'package:todo/data/note_repository.dart';
 import 'package:todo/data/note_template.dart';
+import 'package:todo/ui/image_attach.dart';
+import 'package:todo/ui/image_input.dart';
+import 'package:todo/ui/image_picking.dart';
 import 'package:todo/ui/note_form.dart';
 
 /// Full-screen view of a single note: read it in full, edit its body through
@@ -18,6 +24,7 @@ class NoteDetailScreen extends StatefulWidget {
     required this.note,
     required this.repository,
     required this.appSettings,
+    this.imagePicking,
     super.key,
   });
 
@@ -32,6 +39,9 @@ class NoteDetailScreen extends StatefulWidget {
   /// exactly what made editing look different from capture.
   final ValueNotifier<AppSettings> appSettings;
 
+  /// The 📎 picker; null uses the platform one. Injected by tests.
+  final ImagePicking? imagePicking;
+
   @override
   State<NoteDetailScreen> createState() => _NoteDetailScreenState();
 }
@@ -39,6 +49,18 @@ class NoteDetailScreen extends StatefulWidget {
 class _NoteDetailScreenState extends State<NoteDetailScreen> {
   late Note _note = widget.note;
 
+  /// Inserts attached-image links into the editor.
+  final ImageAttachController _attach = ImageAttachController();
+
+  Future<void> _attachImages(List<Uint8List> images, {int rejected = 0}) =>
+      attachImages(
+        context,
+        noteId: () => _note.id,
+        target: _attach,
+        images: images,
+        rejected: rejected,
+      );
+
   Future<void> _persist(Note next) async {
     setState(() => _note = next);
     await widget.repository.upsert(next);
@@ -65,6 +87,10 @@ class _NoteDetailScreenState extends State<NoteDetailScreen> {
       appBar: AppBar(
         title: Text(title.isEmpty ? '(empty)' : title),
         actions: [
+          AttachImageButton(
+            onImages: _attachImages,
+            picking: widget.imagePicking,
+          ),
           IconButton(
             tooltip: 'Delete note',
             icon: const Icon(Icons.delete_outline),
@@ -72,23 +98,29 @@ class _NoteDetailScreenState extends State<NoteDetailScreen> {
           ),
         ],
       ),
-      body: Padding(
+      body: ImageInputListener(
-        padding: const EdgeInsets.all(16),
+        onImages: (images, rejected) =>
-        // The same form capture renders, gated on the same setting, so an
+            unawaited(_attachImages(images, rejected: rejected)),
-        // edited note and a fresh one cannot look different.
+        child: Padding(
-        child: ValueListenableBuilder<AppSettings>(
+          padding: const EdgeInsets.all(16),
-          valueListenable: widget.appSettings,
+          // The same form capture renders, gated on the same setting, so an
-          builder: (context, settings, _) => NoteForm(
+          // edited note and a fresh one cannot look different.
-            advancedMode: settings.advancedMode,
+          child: ValueListenableBuilder<AppSettings>(
-            initialText: _note.text,
+            valueListenable: widget.appSettings,
-            priority: _note.priority,
+            builder: (context, settings, _) => NoteForm(
-            status: _note.status,
+              advancedMode: settings.advancedMode,
-            onPriorityChanged: (p) => _persist(
+              initialText: _note.text,
-              _note.copyWith(priority: p, updatedAt: DateTime.now()),
+              priority: _note.priority,
+              status: _note.status,
+              onPriorityChanged: (p) => _persist(
+                _note.copyWith(priority: p, updatedAt: DateTime.now()),
+              ),
+              onStatusChanged: (s) => _persist(
+                _note.copyWith(status: s, updatedAt: DateTime.now()),
+              ),
+              onChanged: _onTextChanged,
+              attachController: _attach,
             ),
-            onStatusChanged: (s) =>
-                _persist(_note.copyWith(status: s, updatedAt: DateTime.now())),
-            onChanged: _onTextChanged,
           ),
         ),
       ),

lib/ui/note_editor.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 
 import 'package:todo/data/note.dart';
 import 'package:todo/data/note_template.dart';
+import 'package:todo/ui/image_attach.dart';
 import 'package:todo/ui/markdown_view.dart';
 import 'package:todo/ui/note_editor_chrome.dart';
 import 'package:todo/ui/note_editor_document.dart';
@@ -13,6 +14,7 @@ import 'package:todo/ui/note_editor_wizard.dart';
 
 export 'package:todo/ui/note_editor_mode.dart';
 
+part 'note_editor_images.dart';
 part 'note_editor_views.dart';
 part 'note_editor_widget.dart';
 
@@ -31,6 +33,9 @@ class _NoteEditorState extends State<NoteEditor> {
   /// [_retemplateDraft] from overriding that choice as they keep typing.
   bool _templatePickedByUser = false;
 
+  /// Detaches this editor from [NoteEditor.attachController].
+  VoidCallback? _unbindImages;
+
   @override
   void initState() {
     super.initState();
@@ -40,10 +45,20 @@ class _NoteEditorState extends State<NoteEditor> {
       openingRaw: widget.initialMode == NoteEditorMode.raw,
     );
     _mode = _resolveMode(widget.initialMode);
+    _unbindImages = widget.attachController?.bind(_insertImageLinks);
+  }
+
+  @override
+  void didUpdateWidget(NoteEditor oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (identical(oldWidget.attachController, widget.attachController)) return;
+    _unbindImages?.call();
+    _unbindImages = widget.attachController?.bind(_insertImageLinks);
   }
 
   @override
   void dispose() {
+    _unbindImages?.call();
     _doc.dispose();
     super.dispose();
   }
@@ -140,6 +155,7 @@ class _NoteEditorState extends State<NoteEditor> {
     widget.onChromeVisibleChanged(
       !_enteringGuided && _mode != NoteEditorMode.guided,
     );
+    widget.onModeChanged?.call(_mode);
   }
 
   /// Commits the wizard's template choice and enters the bare stepper.

lib/ui/note_editor_images.dart

@@ -0,0 +1,55 @@
+/// Inserting attached-image links into whichever field is being edited.
+///
+/// A `part` of `note_editor.dart` because it writes the editor's private
+/// controllers (`_doc`) and follows its mode (`_mode`, `_currentStep`).
+part of 'note_editor.dart';
+
+extension _NoteEditorImages on _NoteEditorState {
+  /// Puts [lines] on their own lines at the cursor of the field in view:
+  /// the current step's field in Guided, the body in Raw. With no visible
+  /// cursor (View mode, or a field never focused) they go at the end.
+  void _insertImageLinks(List<String> lines) {
+    final TextEditingController target;
+    var atEnd = _mode == NoteEditorMode.preview;
+    if (_mode == NoteEditorMode.guided && !_doc.rawSource) {
+      _doc.ensureControllers(_doc.template);
+      final sections = _doc.template.sections;
+      target = _doc
+          .section[sections[_currentStep.clamp(0, sections.length - 1)].key]!;
+    } else if (_doc.rawSource) {
+      target = _doc.body;
+    } else {
+      // View mode over guided sections: the last section is the end.
+      _doc.ensureControllers(_doc.template);
+      target = _doc.section[_doc.template.sections.last.key]!;
+      atEnd = true;
+    }
+    _insertBlock(target, lines.join('\n'), atEnd: atEnd);
+    _retemplateDraft();
+    _onStepFieldChanged();
+  }
+}
+
+/// Replaces [controller]'s selection (or appends, when [atEnd] or there is
+/// no selection) with [block], padded with newlines so it sits on its own
+/// lines, and leaves the cursor just after it.
+void _insertBlock(
+  TextEditingController controller,
+  String block, {
+  required bool atEnd,
+}) {
+  final text = controller.text;
+  final selection = controller.selection;
+  final useCursor = !atEnd && selection.isValid;
+  final start = useCursor ? selection.start : text.length;
+  final end = useCursor ? selection.end : text.length;
+  final before = text.substring(0, start);
+  final after = text.substring(end);
+  final lead = before.isEmpty || before.endsWith('\n') ? '' : '\n';
+  final trail = after.startsWith('\n') ? '' : '\n';
+  final inserted = '$lead$block$trail';
+  controller.value = TextEditingValue(
+    text: '$before$inserted$after',
+    selection: TextSelection.collapsed(offset: before.length + inserted.length),
+  );
+}

lib/ui/note_editor_widget.dart

@@ -41,6 +41,8 @@ class NoteEditor extends StatefulWidget {
     this.initialMode = NoteEditorMode.guided,
     this.autofocus = false,
     this.advancedMode = true,
+    this.attachController,
+    this.onModeChanged,
     super.key,
   });
 
@@ -85,6 +87,14 @@ class NoteEditor extends StatefulWidget {
   /// in the gating.
   final bool advancedMode;
 
+  /// Bound to this editor's insert-at-cursor while it is mounted, so the
+  /// screen can drop attached-image links into the field being edited.
+  final ImageAttachController? attachController;
+
+  /// Called with the displayed mode after each mode switch (the thumbnail
+  /// strip hides in View mode, which renders images inline).
+  final ValueChanged<NoteEditorMode>? onModeChanged;
+
   @override
   State<NoteEditor> createState() => _NoteEditorState();
 }

lib/ui/note_form.dart

@@ -12,12 +12,15 @@ import 'package:flutter/material.dart';
 
 import 'package:todo/data/note.dart';
 import 'package:todo/data/note_template.dart';
+import 'package:todo/ui/image_attach.dart';
+import 'package:todo/ui/images/image_strip.dart';
 import 'package:todo/ui/note_editor.dart';
 import 'package:todo/ui/note_form_chrome_gate.dart';
 import 'package:todo/ui/note_meta_row.dart';
 
-/// The metadata row above a [NoteEditor], gated on advanced mode.
+/// The metadata row above a [NoteEditor], gated on advanced mode, and the
-class NoteForm extends StatelessWidget {
+/// attached-image thumbnails below it.
+class NoteForm extends StatefulWidget {
   /// Creates the form for the given note values.
   const NoteForm({
     required this.advancedMode,
@@ -29,6 +32,7 @@ class NoteForm extends StatelessWidget {
     this.initialText = '',
     this.initialTemplate,
     this.autofocus = false,
+    this.attachController,
     super.key,
   });
 
@@ -60,10 +64,34 @@ class NoteForm extends StatelessWidget {
   /// Autofocus the editor, so a fresh capture needs zero taps before typing.
   final bool autofocus;
 
+  /// Where the screen's attach actions insert image links.
+  final ImageAttachController? attachController;
+
+  @override
+  State<NoteForm> createState() => _NoteFormState();
+}
+
+class _NoteFormState extends State<NoteForm> {
+  // The live text, for the thumbnail strip only: a notifier so a keystroke
+  // rebuilds the strip, not the editor.
+  late final ValueNotifier<String> _text = ValueNotifier(widget.initialText);
+  bool _previewing = false;
+
+  @override
+  void dispose() {
+    _text.dispose();
+    super.dispose();
+  }
+
+  void _onChanged(String text) {
+    _text.value = text;
+    widget.onChanged(text);
+  }
+
   @override
   Widget build(BuildContext context) {
     return NoteFormChromeGate(
-      advancedMode: advancedMode,
+      advancedMode: widget.advancedMode,
       builder:
           (context, {required chromeVisible, required onChromeVisibleChanged}) {
             return Column(
@@ -71,26 +99,38 @@ class NoteForm extends StatelessWidget {
               children: [
                 if (chromeVisible) ...[
                   NoteMetaRow(
-                    priority: priority,
+                    priority: widget.priority,
-                    status: status,
+                    status: widget.status,
-                    onPriorityChanged: onPriorityChanged,
+                    onPriorityChanged: widget.onPriorityChanged,
-                    onStatusChanged: onStatusChanged,
+                    onStatusChanged: widget.onStatusChanged,
                   ),
                   const SizedBox(height: 12),
                 ],
                 Expanded(
                   child: NoteEditor(
-                    initialText: initialText,
+                    initialText: widget.initialText,
-                    initialTemplate: initialTemplate,
+                    initialTemplate: widget.initialTemplate,
                     initialMode: NoteEditorMode.raw,
-                    advancedMode: advancedMode,
+                    advancedMode: widget.advancedMode,
-                    priority: priority,
+                    priority: widget.priority,
-                    onPriorityChanged: onPriorityChanged,
+                    onPriorityChanged: widget.onPriorityChanged,
                     onChromeVisibleChanged: onChromeVisibleChanged,
-                    autofocus: autofocus,
+                    autofocus: widget.autofocus,
-                    onChanged: onChanged,
+                    onChanged: _onChanged,
+                    attachController: widget.attachController,
+                    onModeChanged: (mode) => setState(
+                      () => _previewing = mode == NoteEditorMode.preview,
+                    ),
                   ),
                 ),
+                // A sibling of the editor's Expanded, not nested inside it:
+                // an extra Column around the expanding field breaks its
+                // height in release builds (see NoteEditorRawField).
+                if (!_previewing)
+                  ValueListenableBuilder<String>(
+                    valueListenable: _text,
+                    builder: (context, text, _) => ImageStrip(text: text),
+                  ),
               ],
             );
           },

lib/ui/settings_screen.dart

@@ -14,6 +14,7 @@ import 'package:todo/sync/firebase_backend.dart';
 import 'package:todo/sync/google_sign_in_backend.dart';
 import 'package:todo/sync/notes_markdown.dart';
 import 'package:todo/sync/sync_settings.dart';
+import 'package:todo/ui/cloud_images_settings.dart';
 import 'package:todo/ui/github_mirror_screen.dart';
 
 /// Settings screen: the "Enable advanced" toggle plus links to the two sync
@@ -177,11 +178,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
           googleFirebaseFactory:
               widget.googleFirebaseFactory ?? openFirebaseWithGoogle,
           googleAvailable: widget.googleAvailable ?? googleSignInSupported,
-          backup: BackupSlot(
+          backup: BackupSlot(label: 'notes', export: _export, import: _import),
-            label: 'notes',
-            export: _export,
-            import: _import,
-          ),
         ),
       ),
     );
@@ -231,6 +228,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
             trailing: const Icon(Icons.chevron_right),
             onTap: () => unawaited(_openSyncSettings()),
           ),
+          CloudImagesTile(httpClient: widget.httpClient),
           ListTile(
             contentPadding: EdgeInsets.zero,
             title: const Text('Advanced sync (GitHub)'),

pubspec.lock

@@ -264,14 +264,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.14.4"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      sha256: "3854fe5e3bff0b113c658f260b90c95dea17c92db0f2addeac2e343dd9969785"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.35"
   flutter_secure_storage:
     dependency: "direct main"
     description:
       name: flutter_secure_storage
-      sha256: d87713a152ee2f255117bdbbf43da1dea1797e0551e499e0334f0c9dcfafddd2
+      sha256: d4e1fb6b2cb524868929e78dc0282fa000554b22060fb53789dc481c9fc95bb8
       url: "https://pub.dev"
     source: hosted
-    version: "11.1.1"
+    version: "11.2.0"
   flutter_secure_storage_darwin:
     dependency: transitive
     description:
@@ -420,13 +428,77 @@ packages:
     source: hosted
     version: "2.9.9"
   image:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: image
-      sha256: "6300175e00616bbc832e2fc91bfa4d776af5402c81c7151bee6905bb08473c52"
+      sha256: a1e7f4951e538a568e14b856702afc9ae1d2f4b202daced8d22c1b9cd211ce89
       url: "https://pub.dev"
     source: hosted
-    version: "4.9.1"
+    version: "4.10.1"
+  image_picker:
+    dependency: "direct main"
+    description:
+      name: image_picker
+      sha256: d8402284df184bc05f4a2210c6c23983b0720f4cd87cbd05c5390a78af602667
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.3"
+  image_picker_android:
+    dependency: transitive
+    description:
+      name: image_picker_android
+      sha256: "0a55d645a670d6ae11efa948f955ae904afa472f1344fc15a7ddacc20c1e7219"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.8.13+23"
+  image_picker_for_web:
+    dependency: transitive
+    description:
+      name: image_picker_for_web
+      sha256: "66257a3191ab360d23a55c8241c91a6e329d31e94efa7be9cf7a212e65850214"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  image_picker_ios:
+    dependency: transitive
+    description:
+      name: image_picker_ios
+      sha256: "852a7762962f3bb3ad54ef1d342669e41557f466033a676baa8876b367cf4050"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.8.13+8"
+  image_picker_linux:
+    dependency: transitive
+    description:
+      name: image_picker_linux
+      sha256: "1f81c5f2046b9ab724f85523e4af65be1d47b038160a8c8deed909762c308ed4"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.2"
+  image_picker_macos:
+    dependency: transitive
+    description:
+      name: image_picker_macos
+      sha256: "86f0f15a309de7e1a552c12df9ce5b59fe927e71385329355aec4776c6a8ec91"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.2+1"
+  image_picker_platform_interface:
+    dependency: transitive
+    description:
+      name: image_picker_platform_interface
+      sha256: "567e056716333a1647c64bb6bd873cff7622233a5c3f694be28a583d4715690c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.11.1"
+  image_picker_windows:
+    dependency: transitive
+    description:
+      name: image_picker_windows
+      sha256: d248c86554a72b5495a31c56f060cf73a41c7ff541689327b1a7dbccc33adfae
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.2"
   jni:
     dependency: transitive
     description:
@@ -595,14 +667,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      sha256: "91bd59303e9f769f108f8df05e371341b15d59e995e6806aefab827b58336675"
-      url: "https://pub.dev"
-    source: hosted
-    version: "7.0.2"
   platform:
     dependency: transitive
     description:
@@ -970,7 +1034,7 @@ packages:
     source: hosted
     version: "15.2.0"
   web:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: web
       sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
@@ -993,14 +1057,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      sha256: "67f0aff7be013d107995e9b75bf4e7f2c3ef2dfdb2c8e68024bba0a7fd5756a4"
-      url: "https://pub.dev"
-    source: hosted
-    version: "7.0.1"
   yaml:
     dependency: transitive
     description:

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.36+1
+version: 1.0.37+1
 
 environment:
   sdk: ^3.12.2
@@ -53,7 +53,7 @@ dependencies:
 
   # Stores the GitHub sync token in the OS keystore (Android Keystore /
   # libsecret) instead of plaintext SharedPreferences.
-  flutter_secure_storage: 11.1.1
+  flutter_secure_storage: 11.2.0
 
   github_device_auth:
     git:
@@ -66,6 +66,11 @@ dependencies:
   google_sign_in: 7.2.0
   http: 1.6.0
   idb_shim: 2.9.9
+  # Re-encodes attached images (resize, EXIF strip) in pure Dart, so the
+  # phone and the desktop wrapper share one code path.
+  image: 4.10.1
+  # Camera + gallery picks for image attachments on Android.
+  image_picker: 1.2.3
   path: 1.9.1
   path_provider: 2.1.6
   share_plus: 13.3.0
@@ -86,6 +91,8 @@ dependencies:
       path: sync_settings_ui
   url_launcher: 6.3.2
   uuid: 4.6.0
+  # Paste and drag-and-drop listeners on the desktop (web) page.
+  web: 1.1.1
 dev_dependencies:
   # Virtual clock for unit-testing debounced timers (e.g. LocalBackup).
   fake_async: 1.3.3

test/attachments/image_password_store_test.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/attachments/image_password_store.dart';
+
+import '../fake_secure_storage.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  const store = ImagePasswordStore();
+
+  test('write, read, login and delete', () async {
+    installFakeSecureStorage();
+    expect(await store.read(), '');
+    expect(await store.login(), isNull);
+    expect(await store.write('pw'), isTrue);
+    expect(await store.read(), 'pw');
+    final login = (await store.login())!;
+    expect((login.user, login.password), (kDufsImagesUser, 'pw'));
+    expect(await store.write(''), isTrue);
+    expect(await store.read(), '');
+  });
+
+  test('a missing keystore reads as no password and refuses writes', () async {
+    installFakeSecureStorage(throwing: true);
+    expect(await store.read(), '');
+    expect(await store.write('pw'), isFalse);
+  });
+}

test/attachments/image_store_api_test.dart

@@ -0,0 +1,70 @@
+import 'dart:typed_data';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/images/image_ref.dart';
+
+void main() {
+  final ref = ImageRef.create('n1');
+
+  test('NoImageStore refuses to attach and has nothing', () async {
+    final store = NoImageStore();
+    await expectLater(
+      store.attach('n1', Uint8List(1)),
+      throwsA(isA<ImageStoreException>()),
+    );
+    await store.reconcile(['x']);
+    expect(store.sourceFor(ref), isA<MissingImageSource>());
+    expect(store.isPending(ref), isFalse);
+    final status = await store.status();
+    expect((status.configured, status.pending), (false, 0));
+  });
+
+  test('ImageStoreException shows its message', () {
+    expect(const ImageStoreException('boom').toString(), 'boom');
+  });
+
+  test('imageRefsAcross unions every note', () {
+    final other = ImageRef.create('n2');
+    expect(
+      imageRefsAcross([ref.markdown, '${other.markdown}\n${ref.markdown}']),
+      {ref, other},
+    );
+  });
+
+  testWidgets('the scope provides its store, else a NoImageStore', (
+    tester,
+  ) async {
+    final store = NoImageStore();
+    late ImageStore found;
+    late ImageStore read;
+    late ImageStore fallback;
+    await tester.pumpWidget(
+      Column(
+        children: [
+          ImageStoreScope(
+            store: store,
+            child: Builder(
+              builder: (context) {
+                found = ImageStoreScope.of(context);
+                read = ImageStoreScope.read(context);
+                return const SizedBox();
+              },
+            ),
+          ),
+          Builder(
+            builder: (context) {
+              fallback = ImageStoreScope.of(context);
+              return const SizedBox();
+            },
+          ),
+        ],
+      ),
+    );
+    expect(found, same(store));
+    expect(read, same(store));
+    expect(fallback, isA<NoImageStore>());
+  });
+}

test/attachments/image_store_io_test.dart

@@ -0,0 +1,107 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/attachments/image_password_store.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_io.dart';
+import 'package:todo/images/image_cache_store.dart';
+
+import '../fake_secure_storage.dart';
+import '../images/fake_dufs.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  late Directory root;
+  late FakeDufs dufs;
+  late IoImageStore store;
+  late int notified;
+
+  IoImageStore make({Future<Uint8List?> Function(Uint8List)? prepare}) {
+    final s = IoImageStore(
+      ImageCacheStore(root),
+      httpClient: dufs.httpClient,
+      prepare: prepare ?? (b) async => b.first == 0xFF ? b : null,
+    );
+    notified = 0;
+    s.addListener(() => notified++);
+    return s;
+  }
+
+  setUp(() {
+    root = Directory.systemTemp.createTempSync('io_store');
+    dufs = FakeDufs();
+    installFakeSecureStorage(initial: {'dufsImagesPassword': 'pw'});
+    store = make();
+  });
+  tearDown(() => root.deleteSync(recursive: true));
+
+  test('attach stores, notifies and uploads straight away', () async {
+    final ref = (await store.attach('n1', Uint8List.fromList([0xFF, 1])))!;
+    expect(ref.noteId, 'n1');
+    expect(store.sourceFor(ref), isA<LocalImageSource>());
+    expect(notified, greaterThanOrEqualTo(1));
+    await pumpEventQueue();
+    expect(dufs.files[ref.relativePath], [0xFF, 1]);
+    expect(store.isPending(ref), isFalse);
+  });
+
+  test('attach returns null for a non-image and stores nothing', () async {
+    expect(await store.attach('n1', Uint8List.fromList([1])), isNull);
+    expect(root.listSync(), isEmpty);
+  });
+
+  test('attach fails loudly when the image cannot be written', () async {
+    root.deleteSync(recursive: true);
+    File(root.path).writeAsStringSync('not a dir');
+    await expectLater(
+      store.attach('n1', Uint8List.fromList([0xFF])),
+      throwsA(isA<ImageStoreException>()),
+    );
+    File(root.path).deleteSync();
+    root.createSync();
+  });
+
+  test('without a password attach queues offline', () async {
+    installFakeSecureStorage();
+    final ref = (await store.attach('n1', Uint8List.fromList([0xFF])))!;
+    await pumpEventQueue();
+    expect(dufs.requests, isEmpty);
+    expect(store.isPending(ref), isTrue);
+    expect((await store.status()).configured, isFalse);
+    expect((await store.status()).pending, 1);
+  });
+
+  test('reconcile prefetches what notes link to and notifies', () async {
+    dufs.files['n2/b.jpg'] = [7];
+    final before = notified;
+    await store.reconcile([
+      'x\n![](https://kuhy-cloud.duckdns.org/todo-images/n2/b.jpg)',
+    ]);
+    expect(notified, before + 1);
+    final status = await store.status();
+    expect((status.configured, status.pending), (true, 0));
+  });
+
+  test('a reconcile with nothing to do does not notify', () async {
+    await store.reconcile(['no images']);
+    expect(notified, 0);
+  });
+
+  test('a missing image has a missing source', () {
+    final ref = imageRefsAcross([
+      '![](https://kuhy-cloud.duckdns.org/todo-images/n9/z.jpg)',
+    ]).single;
+    expect(store.sourceFor(ref), isA<MissingImageSource>());
+  });
+
+  test('the default prepare and client are the real ones', () {
+    expect(
+      IoImageStore(
+        ImageCacheStore(root),
+        passwords: const ImagePasswordStore(),
+      ),
+      isA<ImageStore>(),
+    );
+  });
+}

test/attachments/image_store_web_test.dart

@@ -0,0 +1,119 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_web.dart';
+import 'package:todo/images/image_ref.dart';
+
+void main() {
+  final requests = <http.Request>[];
+  late int notified;
+
+  WebImageStore make(MockClientHandler handler) {
+    requests.clear();
+    final store = WebImageStore(
+      origin: 'http://localhost:8731',
+      httpClient: MockClient((r) {
+        requests.add(r);
+        return handler(r);
+      }),
+    );
+    notified = 0;
+    store.addListener(() => notified++);
+    return store;
+  }
+
+  http.Response report({int downloaded = 0}) =>
+      http.Response(jsonEncode({'downloaded': downloaded}), 200);
+
+  test('openImageStore targets the serving wrapper', () async {
+    final store = await openImageStore() as WebImageStore;
+    expect(store.origin, 'http://localhost:8730');
+  });
+
+  test('attach POSTs the raw bytes and kicks an upload', () async {
+    final store = make(
+      (r) async =>
+          r.url.path.endsWith('reconcile') ? report() : http.Response('', 204),
+    );
+    final ref = (await store.attach('n1', Uint8List.fromList([1, 2])))!;
+    await pumpEventQueue();
+    expect(requests.first.url.path, '/images/${ref.relativePath}');
+    expect(requests.first.bodyBytes, [1, 2]);
+    expect(requests.last.url.path, '/images/reconcile');
+    expect(jsonDecode(requests.last.body), {'refs': <String>[]});
+    expect(notified, 1);
+    expect(store.sourceFor(ref), isA<NetworkImageSource>());
+    expect(
+      (store.sourceFor(ref) as NetworkImageSource).url,
+      'http://localhost:8731/images/${ref.relativePath}?r=1',
+    );
+    expect(store.isPending(ref), isFalse);
+  });
+
+  test(
+    'attach: 415 is not an image, other codes and no wrapper throw',
+    () async {
+      expect(
+        await make(
+          (_) async => http.Response('', 415),
+        ).attach('n1', Uint8List(1)),
+        isNull,
+      );
+      await expectLater(
+        make((_) async => http.Response('', 500)).attach('n1', Uint8List(1)),
+        throwsA(isA<ImageStoreException>()),
+      );
+      await expectLater(
+        make(
+          (_) => throw const SocketException('no wrapper'),
+        ).attach('n1', Uint8List(1)),
+        throwsA(
+          isA<ImageStoreException>().having(
+            (e) => e.toString(),
+            'message',
+            contains('not running'),
+          ),
+        ),
+      );
+    },
+  );
+
+  test('reconcile sends every linked ref; a download bumps the url', () async {
+    final ref = ImageRef.create('n1');
+    final store = make((_) async => report(downloaded: 1));
+    await store.reconcile(['a ${ref.markdown}', 'none']);
+    expect(jsonDecode(requests.single.body), {
+      'refs': [ref.relativePath],
+    });
+    expect(notified, 1);
+    expect((store.sourceFor(ref) as NetworkImageSource).url, endsWith('r=1'));
+  });
+
+  test('reconcile ignores failures and no-op reports', () async {
+    await make((_) async => report()).reconcile([]);
+    expect(notified, 0);
+    await make((_) async => http.Response('', 500)).reconcile([]);
+    await make((_) => throw const SocketException('x')).reconcile([]);
+    expect(notified, 0);
+  });
+
+  test('status reads the wrapper, and degrades when it is gone', () async {
+    final ok = await make(
+      (_) async => http.Response('{"configured":true,"pending":2}', 200),
+    ).status();
+    expect((ok.configured, ok.pending), (true, 2));
+    final empty = await make((_) async => http.Response('{}', 200)).status();
+    expect((empty.configured, empty.pending), (false, 0));
+    final gone = await make((_) => throw const SocketException('x')).status();
+    expect(gone.configured, isFalse);
+  });
+
+  test('the default http client is created', () {
+    expect(WebImageStore(origin: 'http://x'), isA<ImageStore>());
+  });
+}

test/capture_screen_harness.dart

@@ -17,6 +17,8 @@ import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:todo/analytics/analytics_service.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
 import 'package:todo/data/app_settings.dart';
 import 'package:todo/data/note.dart';
 import 'package:todo/data/note_template.dart';
@@ -24,6 +26,7 @@ import 'package:todo/sync/local_backup.dart';
 import 'package:todo/sync/notes_markdown.dart';
 import 'package:todo/ui/capture_screen.dart';
 import 'package:todo/ui/github_mirror_screen.dart';
+import 'package:todo/ui/image_picking.dart';
 import 'package:todo/ui/settings_screen.dart';
 
 import 'fake_note_repository.dart';
@@ -46,6 +49,8 @@ Future<FakeNoteRepository> pumpCapture(
   // behavior pass advancedMode: false explicitly.
   ValueNotifier<AppSettings>? appSettings,
   AnalyticsService? analytics,
+  ImageStore? imageStore,
+  ImagePicking? imagePicking,
 }) async {
   SharedPreferences.setMockInitialValues(prefs);
   installFakeSecureStorage();
@@ -67,23 +72,25 @@ Future<FakeNoteRepository> pumpCapture(
         writer: (_) async {},
         debounce: Duration.zero,
       );
-  await tester.pumpWidget(
+  final app = MaterialApp(
-    MaterialApp(
+    home: CaptureScreen(
-      home: CaptureScreen(
+      repository: repo,
-        repository: repo,
+      appSettings:
-        appSettings:
+          appSettings ?? ValueNotifier(const AppSettings(advancedMode: true)),
-            appSettings ?? ValueNotifier(const AppSettings(advancedMode: true)),
+      analytics: analytics,
-        analytics: analytics,
+      httpClient: httpClient,
-        httpClient: httpClient,
+      // Both injected so the widget never reaches for the platform: the
-        // Both injected so the widget never reaches for the platform: the
+      // real factories want the OS keystore and an application-support
-        // real factories want the OS keystore and an application-support
+      // directory, neither of which exists under `flutter test`.
-        // directory, neither of which exists under `flutter test`.
+      firebaseFactory: firebaseFactory ?? () async => null,
-        firebaseFactory: firebaseFactory ?? () async => null,
+      stateStore: InMemorySyncStateStore(),
-        stateStore: InMemorySyncStateStore(),
+      localBackup: backup,
-        localBackup: backup,
+      imagePicking: imagePicking,
-      ),
     ),
   );
+  await tester.pumpWidget(
+    imageStore == null ? app : ImageStoreScope(store: imageStore, child: app),
+  );
   await tester.pump(); // flush initial stream + settings load
   return repo;
 }

test/desktop/dufs_login_env_test.dart

@@ -0,0 +1,45 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:path/path.dart' as p;
+import 'package:todo/desktop/dufs_login_env.dart';
+
+void main() {
+  late Directory dir;
+  setUp(() => dir = Directory.systemTemp.createTempSync('dufs_env'));
+  tearDown(() => dir.deleteSync(recursive: true));
+
+  File env(String body) =>
+      File(p.join(dir.path, 'todo.env'))..writeAsStringSync(body);
+
+  test('default path is ~/.config/dufs/logins/todo.env', () {
+    expect(defaultDufsLoginEnvPath('/h'), '/h/.config/dufs/logins/todo.env');
+  });
+
+  test('reads the login add_dufs_login.sh writes', () {
+    final login = readDufsLoginEnv(
+      env(
+        '# written by add_dufs_login.sh\n'
+        'DUFS_URL=https://kuhy-cloud.duckdns.org/\n'
+        'DUFS_USER=todo\nDUFS_PASSWORD=a=b\nDUFS_PATH=/todo-images\nnoise\n',
+      ),
+    )!;
+    expect(login.user, 'todo');
+    expect(login.password, 'a=b', reason: 'only the first = splits');
+    expect(login.baseUrl, 'https://kuhy-cloud.duckdns.org');
+  });
+
+  test('keeps a url without a trailing slash as is', () {
+    final login = readDufsLoginEnv(
+      env('DUFS_URL=http://x\nDUFS_USER=u\nDUFS_PASSWORD=p\n'),
+    )!;
+    expect(login.baseUrl, 'http://x');
+  });
+
+  test('absent or incomplete files give no login', () {
+    expect(readDufsLoginEnv(File(p.join(dir.path, 'nope.env'))), isNull);
+    expect(readDufsLoginEnv(env('DUFS_USER=u\nDUFS_PASSWORD=p\n')), isNull);
+    expect(readDufsLoginEnv(env('DUFS_URL=x\nDUFS_USER=u\n')), isNull);
+    expect(readDufsLoginEnv(env('DUFS_URL=x\nDUFS_PASSWORD=p\n')), isNull);
+  });
+}

test/desktop/wrapper_image_routes_test.dart

@@ -0,0 +1,164 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:path/path.dart' as p;
+import 'package:todo/desktop/wrapper_image_routes.dart';
+import 'package:todo/desktop/wrapper_server.dart';
+import 'package:todo/images/image_cache_store.dart';
+import 'package:todo/images/image_ref.dart';
+
+import '../images/fake_dufs.dart';
+
+void main() {
+  late Directory root;
+  late WrapperServer server;
+  late String base;
+  late FakeDufs dufs;
+  late ImageCacheStore store;
+  const rel = 'n1/0815ff8a-203e-4f54-9cc5-8a58b27982ec.jpg';
+
+  File envFile() => File(p.join(root.path, 'dufs', 'todo.env'));
+
+  void writeLogin() {
+    envFile()
+      ..parent.createSync(recursive: true)
+      ..writeAsStringSync(
+        'DUFS_URL=https://d\nDUFS_USER=todo\nDUFS_PASSWORD=pw\n',
+      );
+  }
+
+  setUp(() async {
+    root = Directory.systemTemp.createTempSync('wrapper_images');
+    dufs = FakeDufs();
+    store = ImageCacheStore(Directory(p.join(root.path, 'images')));
+    server = WrapperServer(
+      webRoot: root.path,
+      backlogPath: p.join(root.path, 'BACKLOG.md'),
+      logPath: p.join(root.path, 'log.json'),
+      todoCredentialsPath: p.join(root.path, 'none.json'),
+      images: WrapperImageRoutes(
+        store: store,
+        loginEnvPath: envFile().path,
+        httpClient: dufs.httpClient,
+        // Identity "re-encode" that still refuses non-images, so the
+        // routes are tested without decoding real photos.
+        prepare: (bytes) async => bytes.first == 0xFF ? bytes : null,
+      ),
+    );
+    await server.start(0);
+    base = 'http://localhost:${server.port}';
+  });
+  tearDown(() async {
+    await server.stop();
+    root.deleteSync(recursive: true);
+  });
+
+  Future<http.Response> reconcile(Object body) =>
+      http.post(Uri.parse('$base/images/reconcile'), body: jsonEncode(body));
+
+  test('the default routes live under the given home', () {
+    final routes = defaultWrapperImageRoutes('/h');
+    expect(routes.store.root.path, '/h/.local/share/todo-desktop/images');
+    expect(routes.loginEnvPath, '/h/.config/dufs/logins/todo.env');
+  });
+
+  test('POST stores and queues an image, GET serves it', () async {
+    final post = await http.post(
+      Uri.parse('$base/images/$rel'),
+      body: Uint8List.fromList([0xFF, 1, 2]),
+    );
+    expect(post.statusCode, 204);
+    expect(store.isPending(ImageRef.tryParse(rel)!), isTrue);
+    final get = await http.get(Uri.parse('$base/images/$rel'));
+    expect(get.statusCode, 200);
+    expect(get.headers['content-type'], 'image/jpeg');
+    expect(get.headers['cache-control'], contains('max-age'));
+    expect(get.bodyBytes, [0xFF, 1, 2]);
+  });
+
+  test('non-images are refused with 415 and nothing is stored', () async {
+    final post = await http.post(
+      Uri.parse('$base/images/$rel'),
+      body: Uint8List.fromList([1, 2]),
+    );
+    expect(post.statusCode, 415);
+    expect(store.pending(), isEmpty);
+  });
+
+  test('oversized uploads are refused with 413', () async {
+    final big = Uint8List(kMaxImageUploadBytes + 1)..[0] = 0xFF;
+    final post = await http.post(Uri.parse('$base/images/$rel'), body: big);
+    expect(post.statusCode, 413);
+  });
+
+  test('unknown image, bad path and bad method', () async {
+    expect((await http.get(Uri.parse('$base/images/$rel'))).statusCode, 404);
+    expect(
+      (await http.get(Uri.parse('$base/images/n1/x.png'))).statusCode,
+      404,
+    );
+    expect((await http.delete(Uri.parse('$base/images/$rel'))).statusCode, 405);
+    expect(
+      (await http.get(Uri.parse('$base/images/reconcile'))).statusCode,
+      404,
+    );
+  });
+
+  test('status reports login and queue', () async {
+    Future<Map<String, dynamic>> status() async =>
+        jsonDecode((await http.get(Uri.parse('$base/images/status'))).body)
+            as Map<String, dynamic>;
+    expect(await status(), {'configured': false, 'pending': 0});
+    writeLogin();
+    await http.post(
+      Uri.parse('$base/images/$rel'),
+      body: Uint8List.fromList([0xFF]),
+    );
+    expect(await status(), {'configured': true, 'pending': 1});
+  });
+
+  test('reconcile uploads with the env login and prefetches', () async {
+    writeLogin();
+    await http.post(
+      Uri.parse('$base/images/$rel'),
+      body: Uint8List.fromList([0xFF, 9]),
+    );
+    dufs.files['n2/b.jpg'] = [5];
+    final response = await reconcile({
+      'refs': [rel, 'n2/b.jpg', '../bad.jpg'],
+    });
+    expect(response.statusCode, 200);
+    expect(jsonDecode(response.body), {
+      'uploaded': 1,
+      'downloaded': 1,
+      'evicted': 0,
+      'pending': 0,
+      'missing': 0,
+    });
+    expect(dufs.files[rel], [0xFF, 9]);
+  });
+
+  test('reconcile without a login only reports', () async {
+    final response = await reconcile({'refs': <String>[]});
+    expect(jsonDecode(response.body)['uploaded'], 0);
+    expect(dufs.requests, isEmpty);
+  });
+
+  test('reconcile rejects malformed bodies', () async {
+    for (final body in ['not json', '[]', '{"refs": [1]}', '{}']) {
+      final response = await http.post(
+        Uri.parse('$base/images/reconcile'),
+        body: body,
+      );
+      expect(response.statusCode, 400, reason: body);
+    }
+  });
+
+  test('jpg is served with an image content type', () {
+    expect(WrapperServer.contentTypeFor('a.JPG').mimeType, 'image/jpeg');
+    expect(WrapperServer.contentTypeFor('a.jpeg').mimeType, 'image/jpeg');
+  });
+}

test/fake_image_store.dart

@@ -0,0 +1,74 @@
+/// An in-memory [ImageStore] for widget tests.
+///
+/// Deliberately NOT named `*_test.dart`: the runner would collect it.
+library;
+
+import 'dart:async';
+import 'dart:typed_data';
+
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/images/image_ref.dart';
+
+/// Records attaches and reconciles; every image is "local" at a fake path
+/// unless listed in [missing].
+class FakeImageStore extends ImageStore {
+  /// Bytes accepted per ref, in attach order.
+  final Map<ImageRef, Uint8List> attached = {};
+
+  /// Note texts passed to each reconcile.
+  final List<List<String>> reconciles = [];
+
+  /// Refs reported as not on this device.
+  final Set<ImageRef> missing = {};
+
+  /// Refs reported as waiting to upload.
+  final Set<ImageRef> pending = {};
+
+  /// Inputs whose first byte is this are "not an image".
+  int notImageMarker = 0;
+
+  /// When set, attach throws this.
+  ImageStoreException? failure;
+
+  /// Where local images appear to live, e.g. a real temp file.
+  String localPath = '/nonexistent/image.jpg';
+
+  /// Returns [NetworkImageSource]s instead of local ones.
+  bool network = false;
+
+  /// When set, attach waits for it first (to act mid-attach).
+  Future<void>? gate;
+
+  @override
+  Future<ImageRef?> attach(String noteId, Uint8List bytes) async {
+    await gate;
+    final failure = this.failure;
+    if (failure != null) throw failure;
+    if (bytes.isNotEmpty && bytes.first == notImageMarker) return null;
+    final ref = ImageRef.create(noteId);
+    attached[ref] = bytes;
+    return ref;
+  }
+
+  @override
+  Future<void> reconcile(Iterable<String> noteTexts) async =>
+      reconciles.add(noteTexts.toList());
+
+  @override
+  ImageSource sourceFor(ImageRef ref) {
+    if (missing.contains(ref)) return const MissingImageSource();
+    return network
+        ? NetworkImageSource('http://localhost/images/$ref')
+        : LocalImageSource(localPath);
+  }
+
+  @override
+  bool isPending(ImageRef ref) => pending.contains(ref);
+
+  @override
+  Future<ImageStoreStatus> status() async =>
+      ImageStoreStatus(configured: true, pending: pending.length);
+
+  /// Lets a test fire a change notification.
+  void changed() => notifyListeners();
+}

test/images/dufs_image_client_test.dart

@@ -0,0 +1,110 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:todo/images/dufs_image_client.dart';
+import 'package:todo/images/image_ref.dart';
+
+void main() {
+  final ref = ImageRef.tryParse('n1/a.jpg')!;
+  const login = DufsLogin(user: 'todo', password: 'pw', baseUrl: 'https://d');
+  final auth = 'Basic ${base64.encode(utf8.encode('todo:pw'))}';
+
+  DufsImageClient client(MockClientHandler handler) =>
+      DufsImageClient(login, httpClient: MockClient(handler));
+
+  test('the default login points at kuhy-cloud', () {
+    expect(const DufsLogin(user: 'u', password: 'p').baseUrl, kDufsBaseUrl);
+  });
+
+  test('upload PUTs the bytes with basic auth; true on 2xx', () async {
+    late http.Request seen;
+    final ok = await client((r) async {
+      seen = r;
+      return http.Response('', 201);
+    }).upload(ref, Uint8List.fromList([1, 2]));
+    expect(ok, isTrue);
+    expect(seen.method, 'PUT');
+    expect(seen.url.toString(), 'https://d/todo-images/n1/a.jpg');
+    expect(seen.headers['authorization'], auth);
+    expect(seen.headers['content-type'], 'image/jpeg');
+    expect(seen.bodyBytes, [1, 2]);
+  });
+
+  test('upload is false on a refusal or a network error', () async {
+    expect(
+      await client(
+        (_) async => http.Response('', 403),
+      ).upload(ref, Uint8List(1)),
+      isFalse,
+    );
+    expect(
+      await client(
+        (_) => throw const SocketException('down'),
+      ).upload(ref, Uint8List(1)),
+      isFalse,
+    );
+  });
+
+  test('download returns bytes on 200, null otherwise', () async {
+    expect(
+      await client((r) async {
+        expect(r.headers['authorization'], auth);
+        return http.Response.bytes([7, 8], 200);
+      }).download(ref),
+      [7, 8],
+    );
+    expect(
+      await client((_) async => http.Response('', 404)).download(ref),
+      isNull,
+    );
+    expect(
+      await client((_) => throw const SocketException('down')).download(ref),
+      isNull,
+    );
+  });
+
+  test('check maps PROPFIND answers', () async {
+    Future<DufsCheck> answer(int code) => client((r) async {
+      expect(r.method, 'PROPFIND');
+      expect(r.headers['depth'], '0');
+      expect(r.url.toString(), 'https://d/todo-images/');
+      return http.Response('', code);
+    }).check();
+    expect(await answer(207), DufsCheck.ok);
+    expect(await answer(401), DufsCheck.rejected);
+    expect(await answer(403), DufsCheck.rejected);
+    expect(await answer(502), DufsCheck.unreachable);
+    expect(
+      await client((_) => throw const SocketException('down')).check(),
+      DufsCheck.unreachable,
+    );
+  });
+
+  test('a default http client is created when none is given', () {
+    DufsImageClient(login).close();
+  });
+
+  test('close closes the http client', () {
+    var closed = false;
+    final inner = _ClosingClient(() => closed = true);
+    DufsImageClient(login, httpClient: inner).close();
+    expect(closed, isTrue);
+  });
+}
+
+class _ClosingClient extends http.BaseClient {
+  _ClosingClient(this.onClose);
+
+  final void Function() onClose;
+
+  @override
+  Future<http.StreamedResponse> send(http.BaseRequest request) =>
+      throw UnimplementedError();
+
+  @override
+  void close() => onClose();
+}

test/images/fake_dufs.dart

@@ -0,0 +1,48 @@
+/// An in-memory dufs for image-sync tests: a map of `todo-images/...` paths
+/// to bytes behind a MockClient, with an [online] switch.
+///
+/// Deliberately NOT named `*_test.dart`: the runner would collect it.
+library;
+
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:todo/images/dufs_image_client.dart';
+
+/// Fake server state plus a client factory over it.
+class FakeDufs {
+  /// Stored files, keyed by the path after `/todo-images/`.
+  final Map<String, List<int>> files = {};
+
+  /// When false every request fails like a dropped connection.
+  bool online = true;
+
+  /// Every request's `METHOD path`, in order.
+  final List<String> requests = [];
+
+  /// The HTTP client the image client talks through.
+  http.Client httpClient() => MockClient((request) async {
+    requests.add('${request.method} ${request.url.path}');
+    if (!online) throw const SocketException('offline');
+    final key = request.url.path.replaceFirst('/todo-images/', '');
+    switch (request.method) {
+      case 'PUT':
+        files[key] = request.bodyBytes;
+        return http.Response('', 201);
+      case 'GET':
+        final bytes = files[key];
+        return bytes == null
+            ? http.Response('', 404)
+            : http.Response.bytes(bytes, 200);
+      default:
+        return http.Response('', 207);
+    }
+  });
+
+  /// A client over this fake.
+  DufsImageClient client() => DufsImageClient(
+    const DufsLogin(user: 'todo', password: 'pw', baseUrl: 'https://d'),
+    httpClient: httpClient(),
+  );
+}

test/images/image_cache_store_test.dart

@@ -0,0 +1,185 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:path/path.dart' as p;
+import 'package:todo/images/image_cache_store.dart';
+import 'package:todo/images/image_ref.dart';
+
+import 'fake_dufs.dart';
+
+void main() {
+  late Directory root;
+  late ImageCacheStore store;
+  late FakeDufs dufs;
+  var now = DateTime(2026, 9, 25, 12);
+
+  final a = ImageRef.tryParse('n1/a.jpg')!;
+  final b = ImageRef.tryParse('n2/b.jpg')!;
+  final bytes = Uint8List.fromList([1, 2, 3]);
+
+  setUp(() {
+    root = Directory.systemTemp.createTempSync('image_cache');
+    now = DateTime.now();
+    store = ImageCacheStore(root, now: () => now);
+    dufs = FakeDufs();
+  });
+  tearDown(() => root.deleteSync(recursive: true));
+
+  void age(ImageRef ref, Duration by) =>
+      store.fileFor(ref).setLastModifiedSync(now.subtract(by));
+
+  test('put stores the file and queues it', () async {
+    await store.put(a, bytes);
+    expect(store.fileFor(a).readAsBytesSync(), bytes);
+    expect(store.isPending(a), isTrue);
+    expect(store.pending(), [a]);
+    expect(File('${store.fileFor(a).path}.tmp').existsSync(), isFalse);
+  });
+
+  test('an empty or missing root has nothing pending', () {
+    root.deleteSync(recursive: true);
+    expect(store.pending(), isEmpty);
+    root.createSync();
+  });
+
+  test('reconcile uploads the queue and clears the marker', () async {
+    await store.put(a, bytes);
+    final report = await store.reconcile({a}, dufs.client());
+    expect(dufs.files['n1/a.jpg'], bytes);
+    expect(store.isPending(a), isFalse);
+    expect(report.toJson(), {
+      'uploaded': 1,
+      'downloaded': 0,
+      'evicted': 0,
+      'pending': 0,
+      'missing': 0,
+    });
+  });
+
+  test('a failed upload keeps the marker for next time', () async {
+    await store.put(a, bytes);
+    dufs.online = false;
+    final report = await store.reconcile({a}, dufs.client());
+    expect(store.isPending(a), isTrue);
+    expect(report.pending, 1);
+    dufs.online = true;
+    expect((await store.reconcile({a}, dufs.client())).uploaded, 1);
+  });
+
+  test('a marker whose file never landed is skipped, not uploaded', () async {
+    await store.put(a, bytes);
+    store.fileFor(a).deleteSync();
+    final report = await store.reconcile({}, dufs.client());
+    expect(report.uploaded, 0);
+    expect(dufs.files, isEmpty);
+  });
+
+  test('without a client only eviction runs', () async {
+    await store.put(a, bytes);
+    final report = await store.reconcile({b}, null);
+    expect(dufs.requests, isEmpty);
+    expect(report.pending, 1);
+    expect(report.missing, 1);
+  });
+
+  test('reconcile downloads linked images this device lacks', () async {
+    dufs.files['n2/b.jpg'] = [9];
+    final report = await store.reconcile({b}, dufs.client());
+    expect(store.fileFor(b).readAsBytesSync(), [9]);
+    expect(report.downloaded, 1);
+    expect(report.missing, 0);
+  });
+
+  test('an image missing on dufs stays missing', () async {
+    final report = await store.reconcile({b}, dufs.client());
+    expect(report.downloaded, 0);
+    expect(report.missing, 1);
+  });
+
+  test('evicts old unlinked cached images only', () async {
+    dufs.files
+      ..['n1/a.jpg'] = [1]
+      ..['n2/b.jpg'] = [2];
+    await store.reconcile({a, b}, dufs.client());
+    age(a, const Duration(hours: 1));
+    age(b, const Duration(hours: 1));
+    final report = await store.reconcile({b}, dufs.client());
+    expect(report.evicted, 1);
+    expect(store.fileFor(a).existsSync(), isFalse);
+    expect(store.fileFor(b).existsSync(), isTrue);
+    expect(dufs.files.keys, contains('n1/a.jpg'), reason: 'never on dufs');
+  });
+
+  test('eviction spares queued and unparseable files', () async {
+    await store.put(a, bytes);
+    age(a, const Duration(hours: 1));
+    File(p.join(root.path, 'n1', 'odd name.jpg'))
+      ..writeAsBytesSync([1])
+      ..setLastModifiedSync(now.subtract(const Duration(hours: 1)));
+    dufs.online = false; // a stays queued
+    final report = await store.reconcile({b}, dufs.client());
+    expect(report.evicted, 0);
+    expect(store.fileFor(a).existsSync(), isTrue);
+    dufs.online = true; // uploaded now, so old + unlinked => evicted
+    expect((await store.reconcile({b}, dufs.client())).evicted, 1);
+    expect(store.fileFor(a).existsSync(), isFalse);
+    expect(File(p.join(root.path, 'n1', 'odd name.jpg')).existsSync(), isTrue);
+  });
+
+  test('a young unlinked image survives the grace period', () async {
+    dufs.files['n1/a.jpg'] = [1];
+    await store.reconcile({a}, dufs.client());
+    final report = await store.reconcile({b}, dufs.client());
+    expect(report.evicted, 0);
+    expect(store.fileFor(a).existsSync(), isTrue);
+  });
+
+  test('an empty ref set never evicts', () async {
+    dufs.files['n1/a.jpg'] = [1];
+    await store.reconcile({a}, dufs.client());
+    age(a, const Duration(days: 1));
+    expect((await store.reconcile({}, dufs.client())).evicted, 0);
+    expect(store.fileFor(a).existsSync(), isTrue);
+  });
+
+  test('calls before a pass starts merge into it', () async {
+    dufs.files
+      ..['n1/a.jpg'] = [1]
+      ..['n2/b.jpg'] = [2];
+    final first = store.reconcile({a}, null);
+    final second = store.reconcile({}, dufs.client()); // upload-only
+    final third = store.reconcile({b}, null);
+    expect(identical(first, second) && identical(second, third), isTrue);
+    final report = await first;
+    // One pass: refs unioned, and the only client given was kept.
+    expect(report.downloaded, 2);
+  });
+
+  test('a call during a running pass gets one follow-up pass', () async {
+    dufs.files['n2/b.jpg'] = [2];
+    final running = store.reconcile({}, dufs.client());
+    await Future<void>.delayed(Duration.zero); // let it start
+    final next = store.reconcile({b}, dufs.client());
+    expect(identical(running, next), isFalse);
+    await running;
+    expect((await next).downloaded, 1);
+  });
+
+  test('a failing pass does not wedge the queue', () async {
+    final boom = ImageCacheStore(
+      Directory(p.join(root.path, 'file-not-dir')),
+      now: () => now,
+    );
+    File(boom.root.path).writeAsStringSync('x');
+    dufs.files['n1/a.jpg'] = [1]; // downloading it must create a dir: fails
+    await expectLater(
+      boom.reconcile({a}, dufs.client()),
+      throwsA(isA<FileSystemException>()),
+    );
+    File(boom.root.path).deleteSync();
+    final report = await boom.reconcile({}, null);
+    expect(report.pending, 0);
+  });
+}

test/images/image_processing_test.dart

@@ -0,0 +1,57 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:image/image.dart' as img;
+import 'package:todo/images/image_processing.dart';
+
+/// A JPEG built in-test (the binary gate forbids committed fixtures), with
+/// GPS coordinates and an EXIF rotation, like a phone photo.
+Uint8List phonePhoto({int width = 4000, int height = 3000}) {
+  final photo = img.Image(width: width, height: height)
+    ..clear(img.ColorRgb8(200, 30, 30));
+  photo.exif.imageIfd.orientation = 6;
+  photo.exif.gpsIfd['GPSLatitude'] = img.IfdValueRational(52, 1);
+  return img.encodeJpg(photo);
+}
+
+void main() {
+  test('the fixture really carries GPS and a rotation', () {
+    final exif = img.decodeJpgExif(phonePhoto(width: 40, height: 30))!;
+    expect(exif.gpsIfd.isEmpty, isFalse);
+    expect(exif.imageIfd.orientation, 6);
+  });
+
+  test('shrinks, applies the rotation and drops all EXIF', () async {
+    final out = (await prepareImageInBackground(phonePhoto()))!;
+    final back = img.decodeJpg(out)!;
+    // Landscape pixels + "rotate 90" => upright portrait, long side capped.
+    expect(back.width, 1920);
+    expect(back.height, kMaxImageSide);
+    expect(img.decodeJpgExif(out)?.isEmpty ?? true, isTrue);
+  });
+
+  test('caps a landscape image on its width', () {
+    final wide = img.encodeJpg(img.Image(width: 3000, height: 1000));
+    final back = img.decodeJpg(prepareImage(wide)!)!;
+    expect(back.width, kMaxImageSide);
+  });
+
+  test('leaves a small image at its size', () {
+    final small = img.encodePng(img.Image(width: 300, height: 200));
+    final back = img.decodeJpg(prepareImage(small)!)!;
+    expect((back.width, back.height), (300, 200));
+  });
+
+  test('flattens transparency onto white', () {
+    final clear = img.Image(width: 8, height: 8, numChannels: 4);
+    final back = img.decodeJpg(prepareImage(img.encodePng(clear))!)!;
+    final pixel = back.getPixel(4, 4);
+    expect([pixel.r, pixel.g, pixel.b], everyElement(greaterThan(250)));
+  });
+
+  test('non-images come back null, including ones the decoder throws on', () {
+    expect(prepareImage(Uint8List.fromList([1, 2, 3])), isNull);
+    expect(prepareImage(Uint8List.fromList('hello world'.codeUnits)), isNull);
+    expect(prepareImage(Uint8List(0)), isNull);
+  });
+}

test/images/image_ref_test.dart

@@ -0,0 +1,74 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/images/image_ref.dart';
+
+void main() {
+  const rel = 'note-1/0815ff8a-203e-4f54-9cc5-8a58b27982ec.jpg';
+  final ref = ImageRef.tryParse(rel)!;
+
+  test('a ref exposes its parts, url and markdown', () {
+    expect(ref.noteId, 'note-1');
+    expect(ref.file, '0815ff8a-203e-4f54-9cc5-8a58b27982ec.jpg');
+    expect(ref.relativePath, rel);
+    expect(ref.url, '$kDufsBaseUrl/$kImagesDir/$rel');
+    expect(ref.markdown, '![](${ref.url})');
+  });
+
+  test('create files a fresh uuid jpg under the note', () {
+    final a = ImageRef.create('n1');
+    final b = ImageRef.create('n1');
+    expect(a.noteId, 'n1');
+    expect(a.file, endsWith('.jpg'));
+    expect(a, isNot(b));
+  });
+
+  test('create refuses an unsafe note id', () {
+    expect(() => ImageRef.create('../x'), throwsArgumentError);
+  });
+
+  test('tryParse rejects traversal, nesting and other extensions', () {
+    for (final bad in [
+      '../x/y.jpg',
+      'a/../b.jpg',
+      'a/b/c.jpg',
+      'a/b.png',
+      'a/.jpg',
+      '/a/b.jpg',
+      'a b/c.jpg',
+    ]) {
+      expect(ImageRef.tryParse(bad), isNull, reason: bad);
+    }
+  });
+
+  test('refs compare by path, so sets dedupe', () {
+    expect({ref, ImageRef.tryParse(rel)!}, hasLength(1));
+  });
+
+  test('imageRefsIn finds every dufs image link, in order, once', () {
+    final other = ImageRef.create('n2');
+    final text =
+        'hi ${ref.markdown} and\n${other.markdown}\n${ref.markdown}\n'
+        '![x](https://example.com/a.jpg) ![]($kDufsBaseUrl/Keepass/a.jpg)';
+    expect(imageRefsIn(text).toList(), [ref, other]);
+    expect(imageRefsIn('no images'), isEmpty);
+  });
+
+  test('imageRefOfLine only matches a line that is just one image', () {
+    expect(imageRefOfLine('  ${ref.markdown}  '), ref);
+    expect(imageRefOfLine('see ${ref.markdown}'), isNull);
+    expect(imageRefOfLine('![alt text](${ref.url})'), ref);
+    expect(imageRefOfLine('plain'), isNull);
+  });
+
+  test('backlog paths round-trip exactly', () {
+    final text = 'a\n${ref.markdown}\n![](https://example.com/x.jpg)';
+    final disk = toBacklogImagePaths(text);
+    expect(disk, contains('![]($kBacklogImagesRoot/$rel)'));
+    expect(disk, isNot(contains(kDufsBaseUrl)));
+    expect(fromBacklogImagePaths(disk), text);
+  });
+
+  test('a bare path outside an image link is left alone', () {
+    const text = 'see $kBacklogImagesRoot/$rel';
+    expect(fromBacklogImagePaths(text), text);
+  });
+}

test/ui_images/capture_images_test.dart

@@ -0,0 +1,119 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/data/app_settings.dart';
+import 'package:todo/data/note.dart';
+import 'package:todo/ui/image_input.dart';
+import 'package:todo/ui/images/image_strip.dart';
+
+import '../capture_screen_harness.dart';
+import '../fake_image_store.dart';
+
+void main() {
+  testWidgets('📎 on an empty draft creates the note under the image id', (
+    tester,
+  ) async {
+    final store = FakeImageStore();
+    final repo = await pumpCapture(
+      tester,
+      imageStore: store,
+      imagePicking: (_) async => [
+        Uint8List.fromList([1]),
+      ],
+      appSettings: ValueNotifier(const AppSettings(advancedMode: false)),
+    );
+    await tester.tap(find.byTooltip('Attach image'));
+    await tester.pump();
+    await tester.pump();
+    final ref = store.attached.keys.single;
+    final notes = await repo.listNotes();
+    expect(notes.single.id, ref.noteId);
+    expect(notes.single.text, contains(ref.markdown));
+    expect(find.byType(ImageStrip), findsOneWidget);
+  });
+
+  testWidgets('📎 on a started draft files under that note', (tester) async {
+    final store = FakeImageStore();
+    final repo = await pumpCapture(
+      tester,
+      imageStore: store,
+      imagePicking: (_) async => [
+        Uint8List.fromList([1]),
+      ],
+      appSettings: ValueNotifier(const AppSettings(advancedMode: false)),
+    );
+    await tester.enterText(find.byType(TextField), 'idea');
+    await tester.pump();
+    final id = (await repo.listNotes()).single.id;
+    await tester.tap(find.byTooltip('Attach image'));
+    await tester.pump();
+    await tester.pump();
+    expect(store.attached.keys.single.noteId, id);
+    expect((await repo.listNotes()).single.text, startsWith('idea\n![]('));
+  });
+
+  testWidgets('launch and resume reconcile with every note', (tester) async {
+    final store = FakeImageStore();
+    await pumpCapture(
+      tester,
+      imageStore: store,
+      seed: [
+        Note(
+          id: 'a',
+          text: 'one',
+          priority: Priority.medium,
+          status: Status.done,
+          createdAt: DateTime(2026),
+          updatedAt: DateTime(2026),
+        ),
+      ],
+    );
+    await tester.pump();
+    expect(store.reconciles, isNotEmpty);
+    expect(store.reconciles.last, ['one']);
+    final before = store.reconciles.length;
+    tester.binding.handleAppLifecycleStateChanged(AppLifecycleState.resumed);
+    await tester.pump();
+    expect(store.reconciles.length, before + 1);
+  });
+
+  testWidgets('a manual sync reconciles images after it', (tester) async {
+    final store = FakeImageStore();
+    await pumpCapture(
+      tester,
+      imageStore: store,
+      prefs: configuredPrefs,
+      httpClient: recordingMock([]),
+    );
+    await tester.pump();
+    final before = store.reconciles.length;
+    await tester.tap(find.byTooltip('Sync'));
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+    expect(store.reconciles.length, greaterThan(before));
+  });
+
+  testWidgets('a paste or drop attaches to the draft', (tester) async {
+    final store = FakeImageStore();
+    final repo = await pumpCapture(
+      tester,
+      imageStore: store,
+      appSettings: ValueNotifier(const AppSettings(advancedMode: false)),
+    );
+    tester.widget<ImageInputListener>(find.byType(ImageInputListener)).onImages(
+      [
+        Uint8List.fromList([1]),
+      ],
+      1,
+    );
+    await tester.pump();
+    await tester.pump();
+    expect(store.attached, hasLength(1));
+    expect(
+      (await repo.listNotes()).single.id,
+      store.attached.keys.single.noteId,
+    );
+    expect(find.text('Not an image'), findsOneWidget);
+  });
+}

test/ui_images/cloud_images_settings_test.dart

@@ -0,0 +1,130 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/ui/cloud_images_settings.dart';
+
+import '../fake_image_store.dart';
+import '../fake_secure_storage.dart';
+
+void main() {
+  Future<void> pump(
+    WidgetTester tester, {
+    ImageStore? store,
+    http.Client? client,
+    bool field = true,
+  }) async {
+    final app = MaterialApp(
+      home: CloudImagesScreen(httpClient: client, showPasswordField: field),
+    );
+    await tester.pumpWidget(
+      store == null ? app : ImageStoreScope(store: store, child: app),
+    );
+    await tester.pump();
+  }
+
+  MockClient answer(int code) =>
+      MockClient((_) async => http.Response('', code));
+
+  Future<void> saveWith(WidgetTester tester, String password) async {
+    await tester.enterText(find.byType(TextField), password);
+    await tester.tap(find.text('Save & test'));
+    await tester.pump();
+    await tester.pump();
+  }
+
+  testWidgets('the settings tile opens the screen', (tester) async {
+    installFakeSecureStorage();
+    await tester.pumpWidget(
+      const MaterialApp(home: Scaffold(body: CloudImagesTile())),
+    );
+    await tester.tap(find.text('Cloud images'));
+    await tester.pumpAndSettle();
+    expect(find.byType(CloudImagesScreen), findsOneWidget);
+  });
+
+  testWidgets('loads the saved password and the store status', (tester) async {
+    installFakeSecureStorage(initial: {'dufsImagesPassword': 'saved'});
+    await pump(tester, store: FakeImageStore());
+    expect(
+      tester.widget<TextField>(find.byType(TextField)).controller!.text,
+      'saved',
+    );
+    expect(find.text('Login: configured'), findsOneWidget);
+    expect(find.text('Waiting to upload: 0'), findsOneWidget);
+  });
+
+  testWidgets('an accepted password is saved and the queue uploads', (
+    tester,
+  ) async {
+    installFakeSecureStorage();
+    final store = FakeImageStore();
+    await pump(tester, store: store, client: answer(207));
+    await saveWith(tester, ' pw ');
+    expect(find.text('Saved — dufs accepted the login'), findsOneWidget);
+    expect(store.reconciles.single, isEmpty);
+  });
+
+  testWidgets('a rejected password says so and uploads nothing', (
+    tester,
+  ) async {
+    installFakeSecureStorage();
+    final store = FakeImageStore();
+    await pump(tester, store: store, client: answer(401));
+    await saveWith(tester, 'bad');
+    expect(find.text('Saved, but dufs rejected the password'), findsOneWidget);
+    expect(store.reconciles, isEmpty);
+  });
+
+  testWidgets('an unreachable dufs is reported', (tester) async {
+    installFakeSecureStorage();
+    await pump(
+      tester,
+      store: FakeImageStore(),
+      client: MockClient((_) => throw const SocketException('down')),
+    );
+    await saveWith(tester, 'pw');
+    expect(find.text('Saved — dufs is unreachable right now'), findsOneWidget);
+  });
+
+  testWidgets('no keystore means nothing is saved', (tester) async {
+    installFakeSecureStorage(throwing: true);
+    await pump(tester, store: FakeImageStore(), client: answer(207));
+    await saveWith(tester, 'pw');
+    expect(
+      find.text('Could not save: the keystore is unavailable'),
+      findsOneWidget,
+    );
+  });
+
+  testWidgets('the desktop shows status only, with the setup command', (
+    tester,
+  ) async {
+    await pump(tester, field: false);
+    expect(find.byType(TextField), findsNothing);
+    expect(
+      find.text('Login: missing — create it on the PC with'),
+      findsOneWidget,
+    );
+    expect(find.text(kAddLoginCommand), findsOneWidget);
+  });
+
+  testWidgets('closing the screen mid-test is harmless', (tester) async {
+    installFakeSecureStorage();
+    final reply = Completer<http.Response>();
+    final store = FakeImageStore();
+    await pump(tester, store: store, client: MockClient((_) => reply.future));
+    await tester.enterText(find.byType(TextField), 'pw');
+    await tester.tap(find.text('Save & test'));
+    await tester.pump();
+    await tester.pumpWidget(const SizedBox());
+    reply.complete(http.Response('', 207));
+    await tester.pump();
+    expect(store.reconciles, isEmpty);
+  });
+}

test/ui_images/detail_and_misc_images_test.dart

@@ -0,0 +1,171 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/data/app_settings.dart';
+import 'package:todo/data/note.dart';
+import 'package:todo/data/note_template_parser.dart';
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/sync/desktop_wrapper.dart';
+import 'package:todo/sync/notes_markdown.dart';
+import 'package:todo/ui/capture_draft.dart';
+import 'package:todo/ui/image_input.dart';
+import 'package:todo/ui/image_input_files.dart';
+import 'package:todo/ui/images/image_embed.dart';
+import 'package:todo/ui/images/image_strip.dart';
+import 'package:todo/ui/markdown_view.dart';
+import 'package:todo/ui/note_detail_screen.dart';
+
+import '../fake_image_store.dart';
+import '../fake_note_repository.dart';
+
+Note note(String text) => Note(
+  id: 'n1',
+  text: text,
+  priority: Priority.medium,
+  status: Status.todo,
+  createdAt: DateTime(2026, 9, 25),
+  updatedAt: DateTime(2026, 9, 25),
+);
+
+void main() {
+  final ref = ImageRef.create('n1');
+
+  testWidgets('detail: 📎 inserts at the cursor and persists', (tester) async {
+    tester.view.physicalSize = const Size(1200, 2400);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+    final store = FakeImageStore();
+    final repo = FakeNoteRepository([note('first\nsecond')]);
+    addTearDown(repo.close);
+    await tester.pumpWidget(
+      ImageStoreScope(
+        store: store,
+        child: MaterialApp(
+          home: NoteDetailScreen(
+            note: note('first\nsecond'),
+            repository: repo,
+            appSettings: ValueNotifier(const AppSettings(advancedMode: true)),
+            imagePicking: (_) async => [
+              Uint8List.fromList([1]),
+            ],
+          ),
+        ),
+      ),
+    );
+    await tester.pump();
+    tester.widget<TextField>(find.byType(TextField)).controller!.selection =
+        const TextSelection.collapsed(offset: 5);
+    await tester.tap(find.byTooltip('Attach image'));
+    await tester.pump();
+    await tester.pump();
+    final added = store.attached.keys.single;
+    expect(added.noteId, 'n1');
+    expect(
+      (await repo.listNotes()).single.text,
+      'first\n${added.markdown}\nsecond',
+    );
+    expect(find.byType(ImageStrip), findsOneWidget);
+    // A paste or drop lands in the same note.
+    tester.widget<ImageInputListener>(find.byType(ImageInputListener)).onImages(
+      [
+        Uint8List.fromList([2]),
+      ],
+      0,
+    );
+    await tester.pump();
+    await tester.pump();
+    expect(store.attached, hasLength(2));
+    expect(store.attached.keys.last.noteId, 'n1');
+    // View mode renders inline and hides the strip.
+    await tester.tap(find.text('View'));
+    await tester.pump();
+    expect(find.byType(ImageStrip), findsNothing);
+    expect(find.byType(ImageEmbed), findsNWidgets(2));
+  });
+
+  testWidgets('markdown view draws an image line as an embed', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(body: MarkdownView(text: 'text\n${ref.markdown}\n')),
+      ),
+    );
+    expect(find.byType(ImageEmbed), findsOneWidget);
+    expect(find.text('text'), findsOneWidget);
+  });
+
+  testWidgets('the io input listener is a pass-through', (tester) async {
+    await tester.pumpWidget(
+      Directionality(
+        textDirection: TextDirection.ltr,
+        child: ImageInputListener(onImages: (_, _) {}, child: const Text('x')),
+      ),
+    );
+    expect(find.text('x'), findsOneWidget);
+  });
+
+  test('partitionImageFiles keeps order and counts the rest', () {
+    final split = partitionImageFiles([
+      'image/png',
+      'application/pdf',
+      'IMAGE/JPEG',
+      '',
+    ]);
+    expect(split.images, [0, 2]);
+    expect(split.rejected, 2);
+  });
+
+  test('noteTitle skips image lines', () {
+    expect(noteTitle('${ref.markdown}\n# Real title'), 'Real title');
+    expect(noteTitle(ref.markdown), 'Image');
+    expect(noteTitle('${ref.markdown}\n\n${ref.markdown}'), '2 images');
+    expect(noteTitle(''), '');
+  });
+
+  test('the backlog export uses disk paths and parses back', () {
+    final exported = NotesMarkdown.export([note('t\n${ref.markdown}')]);
+    expect(exported, contains('![]($kBacklogImagesRoot/${ref.relativePath})'));
+    expect(NotesMarkdown.parse(exported).single.text, 't\n${ref.markdown}');
+  });
+
+  test('the page talks to the wrapper that served it', () {
+    expect(
+      servingWrapperOrigin(Uri.parse('http://localhost:8731/#/x')),
+      'http://localhost:8731',
+    );
+    expect(servingWrapperOrigin(Uri.parse('file:///x')), desktopWrapperOrigin);
+    expect(servingWrapperOrigin(), desktopWrapperOrigin);
+  });
+
+  group('capture draft id reservation', () {
+    late FakeNoteRepository repo;
+    late CaptureDraft draft;
+    setUp(() {
+      repo = FakeNoteRepository([]);
+      draft = CaptureDraft(repo);
+    });
+    tearDown(() async {
+      draft.dispose();
+      await repo.close();
+    });
+
+    test('a reserved id saves nothing until text arrives', () async {
+      final id = draft.reserveId();
+      expect(draft.reserveId(), id);
+      await draft.persistMetadata(live: () => true);
+      expect(await repo.listNotes(), isEmpty);
+      expect(await draft.write('   ', live: () => true), isFalse);
+      expect(await draft.write('x', live: () => true), isTrue);
+      expect((await repo.listNotes()).single.id, id);
+      expect(await draft.write('xy', live: () => true), isFalse);
+    });
+
+    test('reset drops the reservation', () async {
+      final id = draft.reserveId();
+      draft.reset();
+      expect(draft.reserveId(), isNot(id));
+    });
+  });
+}

test/ui_images/image_attach_test.dart

@@ -0,0 +1,148 @@
+import 'dart:async';
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/attachments/image_store_api.dart';
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/ui/image_attach.dart';
+
+import '../fake_image_store.dart';
+
+void main() {
+  test('the controller inserts only while an editor is bound', () {
+    final controller = ImageAttachController();
+    final got = <List<String>>[];
+    expect(controller.insert(['a']), isFalse);
+    final unbind = controller.bind(got.add);
+    expect(controller.insert([]), isFalse);
+    expect(controller.insert(['a']), isTrue);
+    // A later editor's bind wins; the earlier unbind no longer detaches it.
+    final unbindSecond = controller.bind(got.add);
+    unbind();
+    expect(controller.insert(['b']), isTrue);
+    unbindSecond();
+    expect(controller.insert(['c']), isFalse);
+    expect(got, [
+      ['a'],
+      ['b'],
+    ]);
+  });
+
+  Future<BuildContext> pumpScope(WidgetTester tester, ImageStore store) async {
+    late BuildContext context;
+    await tester.pumpWidget(
+      ImageStoreScope(
+        store: store,
+        child: MaterialApp(
+          home: Scaffold(
+            body: Builder(
+              builder: (c) {
+                context = c;
+                return const SizedBox();
+              },
+            ),
+          ),
+        ),
+      ),
+    );
+    return context;
+  }
+
+  testWidgets('attaches in order and inserts every link', (tester) async {
+    final store = FakeImageStore();
+    final context = await pumpScope(tester, store);
+    final controller = ImageAttachController();
+    final inserted = <List<String>>[];
+    controller.bind(inserted.add);
+    var asked = 0;
+    await attachImages(
+      context,
+      noteId: () {
+        asked++;
+        return 'n1';
+      },
+      target: controller,
+      images: [
+        Uint8List.fromList([1]),
+        Uint8List.fromList([2]),
+      ],
+    );
+    expect(asked, 2);
+    expect(store.attached.values.map((b) => b.first), [1, 2]);
+    expect(inserted.single, [
+      for (final ref in store.attached.keys) ref.markdown,
+    ]);
+    await tester.pump();
+    expect(find.byType(SnackBar), findsNothing);
+  });
+
+  testWidgets('reports one non-image', (tester) async {
+    final store = FakeImageStore();
+    final context = await pumpScope(tester, store);
+    await attachImages(
+      context,
+      noteId: () => 'n1',
+      target: ImageAttachController(),
+      images: [
+        Uint8List.fromList([0]),
+      ],
+    );
+    await tester.pump();
+    expect(find.text('Not an image'), findsOneWidget);
+  });
+
+  testWidgets('counts dropped non-images together', (tester) async {
+    final store = FakeImageStore();
+    final context = await pumpScope(tester, store);
+    await attachImages(
+      context,
+      noteId: () => 'n1',
+      target: ImageAttachController(),
+      images: [
+        Uint8List.fromList([0]),
+      ],
+      rejected: 2,
+    );
+    await tester.pump();
+    expect(find.text('3 files were not images'), findsOneWidget);
+  });
+
+  testWidgets('a store failure is shown and stops the batch', (tester) async {
+    final store = FakeImageStore()
+      ..failure = const ImageStoreException('helper down');
+    final context = await pumpScope(tester, store);
+    await attachImages(
+      context,
+      noteId: () => 'n1',
+      target: ImageAttachController(),
+      images: [
+        Uint8List.fromList([1]),
+        Uint8List.fromList([2]),
+      ],
+    );
+    await tester.pump();
+    expect(find.text('helper down'), findsOneWidget);
+  });
+
+  testWidgets('nothing is shown once the screen closed mid-attach', (
+    tester,
+  ) async {
+    final gate = Completer<void>();
+    final store = FakeImageStore()..gate = gate.future;
+    final context = await pumpScope(tester, store);
+    final pending = attachImages(
+      context,
+      noteId: () => 'n1',
+      target: ImageAttachController(),
+      images: [
+        Uint8List.fromList([0]),
+      ],
+    );
+    await tester.pumpWidget(const SizedBox());
+    gate.complete();
+    await pending;
+    await tester.pump();
+    expect(find.byType(SnackBar), findsNothing);
+  });
+}

test/ui_images/image_embed_test.dart

@@ -0,0 +1,97 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:image/image.dart' as img;
+import 'package:todo/attachments/image_store_scope.dart';
+import 'package:todo/images/image_ref.dart';
+import 'package:todo/ui/images/image_embed.dart';
+import 'package:todo/ui/images/image_strip.dart';
+import 'package:todo/ui/images/image_viewer_screen.dart';
+
+import '../fake_image_store.dart';
+
+void main() {
+  final ref = ImageRef.create('n1');
+  late FakeImageStore store;
+  late Directory dir;
+
+  setUp(() {
+    store = FakeImageStore();
+    dir = Directory.systemTemp.createTempSync('embed');
+    final file = File('${dir.path}/a.jpg')
+      ..writeAsBytesSync(img.encodeJpg(img.Image(width: 4, height: 4)));
+    store.localPath = file.path;
+  });
+  tearDown(() => dir.deleteSync(recursive: true));
+
+  Future<void> pump(WidgetTester tester, Widget child) => tester.pumpWidget(
+    ImageStoreScope(
+      store: store,
+      child: MaterialApp(
+        home: Scaffold(body: SizedBox(width: 200, height: 200, child: child)),
+      ),
+    ),
+  );
+
+  testWidgets('a local image renders and opens full screen', (tester) async {
+    await pump(tester, ImageEmbed(ref: ref));
+    expect(find.byType(Image), findsOneWidget);
+    expect(find.byTooltip(kImageWaitingToUpload), findsNothing);
+    await tester.tap(find.byType(ImageEmbed));
+    await tester.pumpAndSettle();
+    expect(find.byType(ImageViewerScreen), findsOneWidget);
+    expect(find.byType(InteractiveViewer), findsOneWidget);
+  });
+
+  testWidgets('a queued image carries the upload badge', (tester) async {
+    store.pending.add(ref);
+    await pump(tester, ImageEmbed(ref: ref));
+    expect(find.byTooltip(kImageWaitingToUpload), findsOneWidget);
+  });
+
+  testWidgets('a missing image is a placeholder and not tappable', (
+    tester,
+  ) async {
+    store.missing.add(ref);
+    await pump(tester, ImageEmbed(ref: ref));
+    expect(find.text(kImageNotDownloaded), findsOneWidget);
+    await tester.tap(find.byType(ImageEmbed));
+    await tester.pumpAndSettle();
+    expect(find.byType(ImageViewerScreen), findsNothing);
+  });
+
+  testWidgets('a broken file or url falls back to the placeholder', (
+    tester,
+  ) async {
+    store.localPath = '${dir.path}/gone.jpg';
+    await pump(tester, ImageEmbed(ref: ref));
+    await tester.runAsync(
+      () => Future<void>.delayed(const Duration(milliseconds: 50)),
+    );
+    await tester.pump();
+    expect(find.text(kImageNotDownloaded), findsOneWidget);
+    store.network = true;
+    store.changed();
+    await tester.pump();
+    await tester.runAsync(
+      () => Future<void>.delayed(const Duration(milliseconds: 50)),
+    );
+    await tester.pump();
+    expect(find.text(kImageNotDownloaded), findsOneWidget);
+  });
+
+  testWidgets('the strip shows one thumbnail per linked image', (tester) async {
+    final other = ImageRef.create('n2');
+    await pump(
+      tester,
+      ImageStrip(text: 'x\n${ref.markdown}\n${other.markdown}'),
+    );
+    expect(find.byType(ImageEmbed), findsNWidgets(2));
+  });
+
+  testWidgets('the strip is empty without images', (tester) async {
+    await pump(tester, const ImageStrip(text: 'no images'));
+    expect(find.byType(ImageEmbed), findsNothing);
+  });
+}

test/ui_images/image_picking_test.dart

@@ -0,0 +1,85 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/ui/image_picking.dart';
+
+void main() {
+  testWidgets('the button passes picked images on, ignores a cancel', (
+    tester,
+  ) async {
+    final got = <List<Uint8List>>[];
+    var result = <Uint8List>[];
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: AttachImageButton(
+            onImages: got.add,
+            picking: (_) async => result,
+          ),
+        ),
+      ),
+    );
+    await tester.tap(find.byTooltip('Attach image'));
+    await tester.pump();
+    expect(got, isEmpty);
+    result = [
+      Uint8List.fromList([1]),
+    ];
+    await tester.tap(find.byTooltip('Attach image'));
+    await tester.pump();
+    expect(got.single.single, [1]);
+  });
+
+  Future<List<Uint8List>?> openSheet(
+    WidgetTester tester,
+    List<ImagePickSource> asked,
+  ) async {
+    List<Uint8List>? result;
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: Builder(
+            builder: (context) => TextButton(
+              onPressed: () async => result = await pickImages(
+                context,
+                fromPhone: (source) async {
+                  asked.add(source);
+                  return [
+                    Uint8List.fromList([source.index]),
+                  ];
+                },
+              ),
+              child: const Text('pick'),
+            ),
+          ),
+        ),
+      ),
+    );
+    await tester.tap(find.text('pick'));
+    await tester.pumpAndSettle();
+    return result;
+  }
+
+  testWidgets('the phone sheet offers Camera and Gallery', (tester) async {
+    final asked = <ImagePickSource>[];
+    await openSheet(tester, asked);
+    expect(find.text('Camera'), findsOneWidget);
+    await tester.tap(find.text('Gallery'));
+    await tester.pumpAndSettle();
+    expect(asked, [ImagePickSource.gallery]);
+    await tester.tap(find.text('pick'));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Camera'));
+    await tester.pumpAndSettle();
+    expect(asked, [ImagePickSource.gallery, ImagePickSource.camera]);
+  });
+
+  testWidgets('dismissing the sheet picks nothing', (tester) async {
+    final asked = <ImagePickSource>[];
+    await openSheet(tester, asked);
+    await tester.tapAt(const Offset(10, 10));
+    await tester.pumpAndSettle();
+    expect(asked, isEmpty);
+  });
+}

test/ui_images/note_editor_images_test.dart

@@ -0,0 +1,164 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:todo/data/note.dart';
+import 'package:todo/data/note_template.dart';
+import 'package:todo/data/note_template_parser.dart';
+import 'package:todo/ui/image_attach.dart';
+import 'package:todo/ui/note_editor.dart';
+
+void main() {
+  late ImageAttachController attach;
+  late List<String> emitted;
+
+  Future<void> pump(
+    WidgetTester tester, {
+    String text = '',
+    NoteTemplate? template,
+    NoteEditorMode mode = NoteEditorMode.raw,
+    ValueChanged<NoteEditorMode>? onModeChanged,
+    Key? key,
+  }) async {
+    attach = ImageAttachController();
+    emitted = [];
+    tester.view.physicalSize = const Size(1200, 2400);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: NoteEditor(
+            key: key,
+            initialText: text,
+            initialTemplate: template,
+            initialMode: mode,
+            priority: Priority.medium,
+            onPriorityChanged: (_) {},
+            onChromeVisibleChanged: (_) {},
+            onChanged: emitted.add,
+            attachController: attach,
+            onModeChanged: onModeChanged,
+          ),
+        ),
+      ),
+    );
+    await tester.pump();
+  }
+
+  TextEditingController field(WidgetTester tester) =>
+      tester.widget<TextField>(find.byType(TextField)).controller!;
+
+  testWidgets('raw: inserts on its own line at the cursor', (tester) async {
+    await pump(tester, text: 'line1\nline2', template: NoteTemplate.blank);
+    field(tester).selection = const TextSelection.collapsed(offset: 5);
+    attach.insert(['IMG1', 'IMG2']);
+    await tester.pump();
+    expect(field(tester).text, 'line1\nIMG1\nIMG2\nline2');
+    expect(field(tester).selection.baseOffset, 'line1\nIMG1\nIMG2'.length);
+    expect(emitted.last, 'line1\nIMG1\nIMG2\nline2');
+  });
+
+  testWidgets('raw: a selection is replaced; no cursor appends', (
+    tester,
+  ) async {
+    await pump(tester, text: 'abc', template: NoteTemplate.blank);
+    field(tester).selection = const TextSelection(
+      baseOffset: 1,
+      extentOffset: 2,
+    );
+    attach.insert(['I']);
+    await tester.pump();
+    expect(field(tester).text, 'a\nI\nc');
+    field(tester).selection = const TextSelection.collapsed(offset: -1);
+    attach.insert(['J']);
+    await tester.pump();
+    expect(field(tester).text, 'a\nI\nc\nJ\n');
+  });
+
+  testWidgets('raw: an empty note gets just the link', (tester) async {
+    await pump(tester, template: NoteTemplate.blank);
+    attach.insert(['I']);
+    await tester.pump();
+    expect(field(tester).text, 'I\n');
+  });
+
+  testWidgets('guided: goes into the current step', (tester) async {
+    await pump(
+      tester,
+      template: NoteTemplate.llmDesignSpec,
+      mode: NoteEditorMode.guided,
+    );
+    expect(find.text('Exit guided'), findsNothing);
+    attach.insert(['IMG']);
+    await tester.pump();
+    expect(field(tester).text, 'IMG\n');
+    expect(emitted.last, contains('IMG'));
+  });
+
+  testWidgets('view over a raw note appends to the end', (tester) async {
+    final modes = <NoteEditorMode>[];
+    await pump(
+      tester,
+      text: 'freeform text',
+      template: NoteTemplate.blank,
+      onModeChanged: modes.add,
+    );
+    await tester.tap(find.text('View'));
+    await tester.pump();
+    expect(modes, [NoteEditorMode.preview]);
+    attach.insert(['IMG']);
+    await tester.pump();
+    expect(emitted.last, 'freeform text\nIMG\n');
+  });
+
+  testWidgets('view over guided sections appends to the last section', (
+    tester,
+  ) async {
+    const spec = NoteTemplate.llmDesignSpec;
+    final text = assemble(spec, {
+      for (final s in spec.sections) s.key: s.isTitle ? 'Title' : 'v ${s.key}',
+    });
+    await pump(
+      tester,
+      text: text,
+      template: spec,
+      mode: NoteEditorMode.preview,
+    );
+    attach.insert(['IMG']);
+    await tester.pump();
+    final last = spec.sections.last;
+    final tail = emitted.last.substring(
+      emitted.last.indexOf('## ${last.label}'),
+    );
+    expect(tail, contains('v ${last.key}\nIMG'));
+  });
+
+  testWidgets('a new controller on the same editor is rebound', (tester) async {
+    await pump(tester, text: 'a', template: NoteTemplate.blank);
+    final first = attach;
+    await pump(tester, text: 'a', template: NoteTemplate.blank);
+    expect(first.insert(['x']), isFalse);
+    expect(attach.insert(['y']), isTrue);
+    // Same controller again: nothing to rebind.
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: NoteEditor(
+            priority: Priority.medium,
+            onPriorityChanged: (_) {},
+            onChromeVisibleChanged: (_) {},
+            onChanged: (_) {},
+            attachController: attach,
+          ),
+        ),
+      ),
+    );
+    expect(attach.insert(['z']), isTrue);
+  });
+
+  testWidgets('disposing the editor unbinds it', (tester) async {
+    await pump(tester, template: NoteTemplate.blank);
+    await tester.pumpWidget(const SizedBox());
+    expect(attach.insert(['x']), isFalse);
+  });
+}

test/wrapper_server_harness.dart

@@ -12,7 +12,9 @@ import 'package:crdt_sync/crdt_sync.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as p;
+import 'package:todo/desktop/wrapper_image_routes.dart';
 import 'package:todo/desktop/wrapper_server.dart';
+import 'package:todo/images/image_cache_store.dart';
 
 /// One test's temp web root and the [WrapperServer] serving it.
 ///
@@ -45,6 +47,7 @@ class WrapperHarness {
         webRoot: webRoot.path,
         backlogPath: p.join(root.path, 'todo', 'BACKLOG.md'),
         logPath: p.join(root.path, 'state', 'todo_notes.json'),
+        images: images(),
         // Without this, the default falls back to the real
         // $HOME/.config/todo/firebase_auth.json -- on a machine that has
         // actually signed in (a real desktop session), that file exists, so
@@ -67,6 +70,14 @@ class WrapperHarness {
     });
   }
 
+  /// Image routes rooted in this test's temp dir. Without them the server
+  /// defaults to the real `~/.local/share/todo-desktop/images` and the real
+  /// dufs login in `~/.config/dufs/logins/todo.env`.
+  WrapperImageRoutes images() => WrapperImageRoutes(
+    store: ImageCacheStore(Directory(p.join(root.path, 'images'))),
+    loginEnvPath: p.join(root.path, 'dufs', 'todo.env'),
+  );
+
   Future<String> enabledOrigin(
     Map<String, String> files, {
     String? credentialsJson,
@@ -87,6 +98,7 @@ class WrapperHarness {
       webRoot: p.join(root.path, 'web'),
       backlogPath: p.join(root.path, 'todo', 'BACKLOG.md'),
       logPath: p.join(root.path, 'state', 'todo_notes.json'),
+      images: images(),
       serveSyncAccount: true,
       syncConfigDir: configDir.path,
       todoCredentialsPath:

tool/image_e2e_wrapper.dart

@@ -0,0 +1,32 @@
+// A throwaway desktop wrapper for end-to-end runs of the web build, on a
+// port and HOME of its own, so a test page can never write the real
+// BACKLOG.md, note-log copy or image cache (the page talks only to the
+// wrapper that served it; see servingWrapperOrigin).
+//
+//   HOME=$(mktemp -d) dart run tool/image_e2e_wrapper.dart \
+//       --port 8731 --web-root build/web
+//
+// Images use $HOME/.local/share/todo-desktop/images and the login in
+// $HOME/.config/dufs/logins/todo.env, exactly like the real wrapper.
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:todo/desktop/wrapper_server.dart';
+
+Future<void> main(List<String> args) async {
+  String arg(String name, String fallback) {
+    final i = args.indexOf(name);
+    return i >= 0 && i + 1 < args.length ? args[i + 1] : fallback;
+  }
+
+  final home = Platform.environment['HOME']!;
+  final port = int.parse(arg('--port', '8731'));
+  final server = WrapperServer(
+    webRoot: p.absolute(arg('--web-root', 'build/web')),
+    // The real wrapper's layout, under the throwaway HOME.
+    backlogPath: defaultBacklogPath(home),
+    logPath: p.join(home, '.local', 'share', 'todo-desktop', 'todo_notes.json'),
+  );
+  await server.start(port);
+  stdout.writeln('e2e wrapper on http://localhost:$port (HOME=$home)');
+}