diff --git a/apps/mobile/lib/core/api_client.dart b/apps/mobile/lib/core/api_client.dart
index c1c119a..7dfe934 100644
--- a/apps/mobile/lib/core/api_client.dart
+++ b/apps/mobile/lib/core/api_client.dart
@@ -330,17 +330,48 @@ class ApiClient {
   /// 一步上传相册封面：选图 → presign → PUT → complete。
   /// [filePath] 是本机源文件路径（由 singleImagePicker 返回）。
   /// 返回封面短期 URL（仅用于即时预览；列表走 AlbumSummary.cover）。
-  Future<String> uploadAlbumCoverFromFile(
+  Future<String> uploadAlbumCoverFromFile(String albumId, String filePath) =>
+      uploadAlbumAssetFromFile(
+        albumId,
+        kind: assetKindCover,
+        filePath: filePath,
+      );
+
+  /// 资产现状（listAlbumAssetStatus）：指定 kind 的全局行（locale null）URL；
+  /// 未设置返回 null。banner 预览用（语言行不区分——编辑页只管全局）。
+  Future<String?> fetchAlbumAssetUrl(
     String albumId,
-    String filePath,
-  ) async {
+    String kind, {
+    String? locale,
+  }) async {
+    final resp = await _send(
+      () => _dio.get<Map<String, dynamic>>('/v1/albums/$albumId/assets'),
+    );
+    final items = (resp.data!['items'] as List<dynamic>)
+        .cast<Map<String, dynamic>>();
+    for (final item in items) {
+      if (item['kind'] == kind && item['locale'] == locale) {
+        return item['url'] as String;
+      }
+    }
+    return null;
+  }
+
+  /// 一步上传相册资产（banner/cover/logo）：选图 → presign → PUT → complete。
+  /// [filePath] 是本机源文件路径（由 singleImagePicker 返回）。
+  /// 返回资产短期 URL（仅用于即时预览；现状经 [fetchAlbumAssetUrl] 查询）。
+  Future<String> uploadAlbumAssetFromFile(
+    String albumId, {
+    required String kind,
+    required String filePath,
+  }) async {
     final file = File(filePath);
     final bytes = await file.length();
     final filename = filePath.split(Platform.pathSeparator).last;
     final contentType = _guessContentType(filename);
     final init = await initAlbumAsset(
       albumId,
-      kind: assetKindCover,
+      kind: kind,
       filename: filename,
       bytes: bytes,
       contentType: contentType,
diff --git a/apps/mobile/lib/l10n/app_en.arb b/apps/mobile/lib/l10n/app_en.arb
index 5905e57..1839ae0 100644
--- a/apps/mobile/lib/l10n/app_en.arb
+++ b/apps/mobile/lib/l10n/app_en.arb
@@ -417,5 +417,9 @@
   "deleteAlbum": "Delete album",
   "deleteAlbumConfirmTitle": "Delete this album?",
   "deleteAlbumConfirmBody": "The album becomes invisible immediately and cannot be restored. Data is retained; recovery requires operations.",
-  "albumDeleted": "Album deleted"
+  "albumDeleted": "Album deleted",
+  "bannerPicker": "Banner",
+  "bannerPickerHint": "Tap to pick a banner image (shown atop the viewer page)",
+  "bannerSelected": "Banner selected — will upload on save",
+  "bannerUploadFailed": "Banner upload failed"
 }
diff --git a/apps/mobile/lib/l10n/app_localizations.dart b/apps/mobile/lib/l10n/app_localizations.dart
index e587c5f..2204946 100644
--- a/apps/mobile/lib/l10n/app_localizations.dart
+++ b/apps/mobile/lib/l10n/app_localizations.dart
@@ -1957,6 +1957,30 @@ abstract class AppLocalizations {
   /// In zh, this message translates to:
   /// **'相册已删除'**
   String get albumDeleted;
+
+  /// No description provided for @bannerPicker.
+  ///
+  /// In zh, this message translates to:
+  /// **'宣传图'**
+  String get bannerPicker;
+
+  /// No description provided for @bannerPickerHint.
+  ///
+  /// In zh, this message translates to:
+  /// **'点击选择宣传图（展示在观众页顶部）'**
+  String get bannerPickerHint;
+
+  /// No description provided for @bannerSelected.
+  ///
+  /// In zh, this message translates to:
+  /// **'已选择宣传图——保存时上传'**
+  String get bannerSelected;
+
+  /// No description provided for @bannerUploadFailed.
+  ///
+  /// In zh, this message translates to:
+  /// **'宣传图上传失败'**
+  String get bannerUploadFailed;
 }
 
 class _AppLocalizationsDelegate
diff --git a/apps/mobile/lib/l10n/app_localizations_en.dart b/apps/mobile/lib/l10n/app_localizations_en.dart
index 8d6bb9b..41df308 100644
--- a/apps/mobile/lib/l10n/app_localizations_en.dart
+++ b/apps/mobile/lib/l10n/app_localizations_en.dart
@@ -1000,4 +1000,17 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get albumDeleted => 'Album deleted';
+
+  @override
+  String get bannerPicker => 'Banner';
+
+  @override
+  String get bannerPickerHint =>
+      'Tap to pick a banner image (shown atop the viewer page)';
+
+  @override
+  String get bannerSelected => 'Banner selected — will upload on save';
+
+  @override
+  String get bannerUploadFailed => 'Banner upload failed';
 }
diff --git a/apps/mobile/lib/l10n/app_localizations_zh.dart b/apps/mobile/lib/l10n/app_localizations_zh.dart
index 258d252..933b836 100644
--- a/apps/mobile/lib/l10n/app_localizations_zh.dart
+++ b/apps/mobile/lib/l10n/app_localizations_zh.dart
@@ -968,4 +968,16 @@ class AppLocalizationsZh extends AppLocalizations {
 
   @override
   String get albumDeleted => '相册已删除';
+
+  @override
+  String get bannerPicker => '宣传图';
+
+  @override
+  String get bannerPickerHint => '点击选择宣传图（展示在观众页顶部）';
+
+  @override
+  String get bannerSelected => '已选择宣传图——保存时上传';
+
+  @override
+  String get bannerUploadFailed => '宣传图上传失败';
 }
diff --git a/apps/mobile/lib/l10n/app_zh.arb b/apps/mobile/lib/l10n/app_zh.arb
index 6720737..c28b0ac 100644
--- a/apps/mobile/lib/l10n/app_zh.arb
+++ b/apps/mobile/lib/l10n/app_zh.arb
@@ -417,5 +417,9 @@
   "deleteAlbum": "删除相册",
   "deleteAlbumConfirmTitle": "删除这个相册？",
   "deleteAlbumConfirmBody": "删除后立即不可见且不可恢复。数据保留，恢复需运维处理。",
-  "albumDeleted": "相册已删除"
+  "albumDeleted": "相册已删除",
+  "bannerPicker": "宣传图",
+  "bannerPickerHint": "点击选择宣传图（展示在观众页顶部）",
+  "bannerSelected": "已选择宣传图——保存时上传",
+  "bannerUploadFailed": "宣传图上传失败"
 }
diff --git a/apps/mobile/lib/pages/album_form_page.dart b/apps/mobile/lib/pages/album_form_page.dart
index d0b6235..a0fecdf 100644
--- a/apps/mobile/lib/pages/album_form_page.dart
+++ b/apps/mobile/lib/pages/album_form_page.dart
@@ -89,16 +89,34 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
   /// 创建模式：相册创建成功后上传；编辑模式：保存后上传。
   String? _coverFilePath;
 
+  /// 用户选择的宣传图本机文件路径（null = 未选；上传时机同封面）。
+  String? _bannerFilePath;
+
+  /// 编辑模式下的现有宣传图 URL（asset 现状查询，异步加载即时预览）。
+  String? _existingBannerUrl;
+
   /// 编辑模式下的现有封面 URL（来自 AlbumSummary.cover，即时预览）。
-  String? get _existingCoverUrl => _coverFilePath == null
-      ? (widget.existing?.cover?.url)
-      : null;
+  String? get _existingCoverUrl =>
+      _coverFilePath == null ? (widget.existing?.cover?.url) : null;
 
   bool get _isCreate => widget.existing == null;
 
   @override
   void initState() {
     super.initState();
+    // 编辑模式：加载现有宣传图预览（asset 现状查询；失败静默不阻塞表单）。
+    if (widget.existing != null) {
+      Future<void>.microtask(() async {
+        try {
+          final url = await ref
+              .read(apiClientProvider)
+              .fetchAlbumAssetUrl(widget.existing!.id, 'banner');
+          if (mounted) setState(() => _existingBannerUrl = url);
+        } on Object {
+          // 预览加载失败不阻塞表单
+        }
+      });
+    }
     final initial = widget.existing == null
         ? (widget.initialDraft ??
               AlbumFormDraft(
@@ -245,7 +263,9 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
         albumId = album.id;
       } else {
         final patch = draft.toUpdatePatch(widget.existing!);
-        if (patch == null && _coverFilePath == null) {
+        if (patch == null &&
+            _coverFilePath == null &&
+            _bannerFilePath == null) {
           navigator.pop(false);
           return;
         }
@@ -269,6 +289,22 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
           );
         }
       }
+      // 宣传图上传：同封面——保存成功后执行，失败不阻塞表单结果。
+      if (_bannerFilePath != null) {
+        try {
+          await ref
+              .read(apiClientProvider)
+              .uploadAlbumAssetFromFile(
+                albumId,
+                kind: 'banner',
+                filePath: _bannerFilePath!,
+              );
+        } on Object {
+          messenger.showSnackBar(
+            SnackBar(content: Text(l10n.bannerUploadFailed)),
+          );
+        }
+      }
       navigator.pop(true);
     } on AppException catch (error) {
       // 保存失败：保留输入，仅提示。
@@ -370,7 +406,12 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
         ),
         // 保存按钮固定底部：键盘打开时常驻可达（§4.5）。
         bottomNavigationBar: SafeArea(
-          minimum: const EdgeInsets.fromLTRB(kSpace16, kSpace8, kSpace16, kSpace12),
+          minimum: const EdgeInsets.fromLTRB(
+            kSpace16,
+            kSpace8,
+            kSpace16,
+            kSpace12,
+          ),
           child: FilledButton(
             onPressed: _canSubmit ? _submit : null,
             child: _submitting
@@ -385,8 +426,8 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
         body: mainTabs == null
             ? _detailsForm(l10n)
             : _mainIndex == 0
-                ? _detailsForm(l10n)
-                : _accessPanel(l10n),
+            ? _detailsForm(l10n)
+            : _accessPanel(l10n),
       ),
     );
   }
@@ -396,8 +437,7 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
-        Text(l10n.coverPicker,
-            style: Theme.of(context).textTheme.titleMedium),
+        Text(l10n.coverPicker, style: Theme.of(context).textTheme.titleMedium),
         const SizedBox(height: kSpace8),
         InkWell(
           onTap: _submitting ? null : _pickCoverImage,
@@ -422,42 +462,43 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
                       errorBuilder: (_, _, _) => _coverPlaceholder(l10n),
                     )
                   : _existingCoverUrl != null
-                      ? Image.network(
-                          _existingCoverUrl!,
-                          fit: BoxFit.cover,
-                          errorBuilder: (_, _, _) => _coverPlaceholder(l10n),
-                        )
-                      : _coverPlaceholder(l10n),
+                  ? Image.network(
+                      _existingCoverUrl!,
+                      fit: BoxFit.cover,
+                      errorBuilder: (_, _, _) => _coverPlaceholder(l10n),
+                    )
+                  : _coverPlaceholder(l10n),
             ),
           ),
         ),
         const SizedBox(height: kSpace4),
         Text(
-          _coverFilePath != null
-              ? l10n.coverSelected
-              : l10n.coverPickerHint,
+          _coverFilePath != null ? l10n.coverSelected : l10n.coverPickerHint,
           style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                color: Theme.of(context).colorScheme.onSurfaceVariant,
-              ),
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
         ),
       ],
     );
   }
 
   Widget _coverPlaceholder(AppLocalizations l10n) => Column(
-        mainAxisAlignment: MainAxisAlignment.center,
-        children: [
-          Icon(Icons.add_photo_alternate_outlined,
-              size: 48, color: Theme.of(context).colorScheme.primary),
-          const SizedBox(height: kSpace8),
-          Text(
-            l10n.coverPickerHint,
-            style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                  color: Theme.of(context).colorScheme.onSurfaceVariant,
-                ),
-          ),
-        ],
-      );
+    mainAxisAlignment: MainAxisAlignment.center,
+    children: [
+      Icon(
+        Icons.add_photo_alternate_outlined,
+        size: 48,
+        color: Theme.of(context).colorScheme.primary,
+      ),
+      const SizedBox(height: kSpace8),
+      Text(
+        l10n.coverPickerHint,
+        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+          color: Theme.of(context).colorScheme.onSurfaceVariant,
+        ),
+      ),
+    ],
+  );
 
   Future<void> _pickCoverImage() async {
     final path = await ref.read(singleImagePickerProvider)();
@@ -466,6 +507,81 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
     }
   }
 
+  Future<void> _pickBannerImage() async {
+    final path = await ref.read(singleImagePickerProvider)();
+    if (path != null) {
+      setState(() => _bannerFilePath = path);
+    }
+  }
+
+  /// 宣传图（banner）选择器：3:1 横幅可点击区域；编辑模式显示现有 banner。
+  Widget _buildBannerPicker(AppLocalizations l10n) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(l10n.bannerPicker, style: Theme.of(context).textTheme.titleMedium),
+        const SizedBox(height: kSpace8),
+        InkWell(
+          onTap: _submitting ? null : _pickBannerImage,
+          borderRadius: BorderRadius.circular(kRadiusInput),
+          child: Container(
+            height: 120,
+            width: double.infinity,
+            decoration: BoxDecoration(
+              color: Theme.of(context).colorScheme.surfaceContainerHighest,
+              borderRadius: BorderRadius.circular(kRadiusInput),
+              border: Border.all(
+                color: Theme.of(context).colorScheme.outlineVariant,
+                width: 1,
+              ),
+            ),
+            child: ClipRRect(
+              borderRadius: BorderRadius.circular(kRadiusInput),
+              child: _bannerFilePath != null
+                  ? Image.file(
+                      File(_bannerFilePath!),
+                      fit: BoxFit.cover,
+                      errorBuilder: (_, _, _) => _bannerPlaceholder(l10n),
+                    )
+                  : _existingBannerUrl != null
+                  ? Image.network(
+                      _existingBannerUrl!,
+                      fit: BoxFit.cover,
+                      errorBuilder: (_, _, _) => _bannerPlaceholder(l10n),
+                    )
+                  : _bannerPlaceholder(l10n),
+            ),
+          ),
+        ),
+        const SizedBox(height: kSpace4),
+        Text(
+          _bannerFilePath != null ? l10n.bannerSelected : l10n.bannerPickerHint,
+          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _bannerPlaceholder(AppLocalizations l10n) => Column(
+    mainAxisAlignment: MainAxisAlignment.center,
+    children: [
+      Icon(
+        Icons.panorama_outlined,
+        size: 40,
+        color: Theme.of(context).colorScheme.primary,
+      ),
+      const SizedBox(height: kSpace8),
+      Text(
+        l10n.bannerPickerHint,
+        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+          color: Theme.of(context).colorScheme.onSurfaceVariant,
+        ),
+      ),
+    ],
+  );
+
   /// Details（= 创建表单）：封面选择 + 分组字段 + 校验错误汇总。
   Widget _detailsForm(AppLocalizations l10n) {
     return Form(
@@ -477,6 +593,10 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
             children: [
               // ── 封面选择（16:9 可点击区域） ─────────────────
               _buildCoverPicker(l10n),
+              const SizedBox(height: kSpace16),
+
+              // ── 宣传图选择（3:1 横幅；编辑模式显示现有 banner）──
+              _buildBannerPicker(l10n),
               const SizedBox(height: kSpace24),
 
               // ── 分组 1：Event details ──────────────────────────
diff --git a/apps/mobile/test/pages/album_form_page_test.dart b/apps/mobile/test/pages/album_form_page_test.dart
index 6d92393..d518a43 100644
--- a/apps/mobile/test/pages/album_form_page_test.dart
+++ b/apps/mobile/test/pages/album_form_page_test.dart
@@ -244,6 +244,7 @@ void main() {
       ),
     );
     await pumpForm(tester, clientOf(adapter), existing: existing);
+    adapter.requests.clear();
 
     // 顶栏 TabBar（Details/Access）+ 内容区语言 TabBar。
     expect(find.text('Edit album'), findsOneWidget);
@@ -275,6 +276,9 @@ void main() {
       clientOf(adapter),
       existing: Album.fromJson(albumJson()),
     );
+    adapter.requests.clear();
+    // UI06：banner 现状预检（GET /assets）已记录——清空后断言只看用户动作。
+    adapter.requests.clear();
 
     // Details 页签输入标题。
     await tester.enterText(find.byType(TextFormField).at(1), '闭幕演出');
@@ -302,6 +306,9 @@ void main() {
       clientOf(adapter),
       existing: Album.fromJson(albumJson()),
     );
+    adapter.requests.clear();
+    // UI06：banner 现状预检（GET /assets）已记录——清空后断言只看用户动作。
+    adapter.requests.clear();
 
     await openAccessTab(tester);
 
@@ -367,6 +374,7 @@ void main() {
     final existing =
         Album.fromJson(albumJson(originalDownloadEnabled: true));
     await pumpForm(tester, clientOf(adapter), existing: existing);
+    adapter.requests.clear();
 
     await openAccessTab(tester);
 
@@ -398,6 +406,7 @@ void main() {
     );
     final existing = Album.fromJson(albumJson());
     await pumpForm(tester, clientOf(adapter), existing: existing);
+    adapter.requests.clear();
 
     await openAccessTab(tester);
     await tester
@@ -427,6 +436,7 @@ void main() {
       albumJson(endAt: '2026-09-19T10:00:00Z'),
     );
     await pumpForm(tester, clientOf(adapter), existing: existing);
+    adapter.requests.clear();
 
     await tapVisible(tester, find.byTooltip('Clear end time'));
     await tester.pump();
@@ -446,6 +456,7 @@ void main() {
     );
     final existing = Album.fromJson(albumJson());
     await pumpForm(tester, clientOf(adapter), existing: existing);
+    adapter.requests.clear();
 
     await tester.enterText(
       find.byType(TextFormField).at(1),
diff --git a/apps/viewer/e2e/verify-share.mjs b/apps/viewer/e2e/verify-share.mjs
new file mode 100644
index 0000000..e525cd9
--- /dev/null
+++ b/apps/viewer/e2e/verify-share.mjs
@@ -0,0 +1,30 @@
+import { chromium } from '@playwright/test';
+const browser = await chromium.launch();
+const page = await browser.newPage({ viewport: { width: 390, height: 844 } });
+await page.goto('http://219.157.255.213:32006/a/nzmk2kr4trzemiwmv65uwxva');
+await page.locator('.share-btn').waitFor({ timeout: 15000 });
+
+// ① 相册页分享按钮 → 弹层
+await page.locator('.share-btn').click();
+const sheet = page.locator('.share-sheet');
+await sheet.waitFor({ timeout: 5000 });
+const urlText = await page.locator('[data-test="share-sheet-url"]').textContent();
+const qr = await page.locator('.share-sheet-qr canvas').evaluate((el) => el.width);
+const copyBtn = page.locator('[data-test="share-sheet-copy"]');
+await copyBtn.click();
+await page.waitForTimeout(400);
+const feedback = await copyBtn.textContent();
+console.log('[album] url =', urlText?.slice(0, 60));
+console.log('[album] qr canvas width =', qr, '; copy feedback =', feedback?.trim());
+await page.screenshot({ path: '../../docs/designs/ui04-implementation/actual/server/share-sheet-album.png' });
+
+// 关闭弹层（Esc），打开大图再验证照片分享
+await page.keyboard.press('Escape');
+await page.locator('img').first().click();
+await page.waitForTimeout(1200);
+await page.locator('button[aria-label="分享照片"]').click();
+await sheet.waitFor({ timeout: 5000 });
+const photoUrl = await page.locator('[data-test="share-sheet-url"]').textContent();
+console.log('[photo] url =', photoUrl?.slice(0, 70));
+await page.screenshot({ path: '../../docs/designs/ui04-implementation/actual/server/share-sheet-photo.png' });
+await browser.close();
diff --git a/docs/designs/ui04-implementation/actual/server/share-sheet-album.png b/docs/designs/ui04-implementation/actual/server/share-sheet-album.png
new file mode 100644
index 0000000..a4ff8fe
Binary files /dev/null and b/docs/designs/ui04-implementation/actual/server/share-sheet-album.png differ