diff --git a/lib/utils/format.dart b/lib/utils/format.dart
new file mode 100644
index 00000000..9e376f35
--- /dev/null
+++ b/lib/utils/format.dart
@@ -0,0 +1,9 @@
+String formatFileSize(int bytes) {
+  if (bytes <= 0) return '0 B';
+  if (bytes < 1024) return '$bytes B';
+  if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(2)} KB';
+  if (bytes < 1024 * 1024 * 1024) {
+    return '${(bytes / (1024 * 1024)).toStringAsFixed(2)} MB';
+  }
+  return '${(bytes / (1024 * 1024 * 1024)).toStringAsFixed(2)} GB';
+}
diff --git a/lib/widgets/content/attachment_preview.dart b/lib/widgets/content/attachment_preview.dart
index 17d6dedf..da611a47 100644
--- a/lib/widgets/content/attachment_preview.dart
+++ b/lib/widgets/content/attachment_preview.dart
@@ -10,6 +10,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:island/models/file.dart';
 import 'package:island/pods/network.dart';
 import 'package:island/services/file.dart';
+import 'package:island/utils/format.dart';
 import 'package:island/widgets/alert.dart';
 import 'package:island/widgets/content/cloud_files.dart';
 import 'package:island/widgets/content/sheet.dart';
@@ -284,6 +285,13 @@ class AttachmentPreview extends HookConsumerWidget {
                   Builder(
                     key: ValueKey(item.hashCode),
                     builder: (context) {
+                      final fallbackIcon = switch (item.type) {
+                        UniversalFileType.video => Symbols.video_file,
+                        UniversalFileType.audio => Symbols.audio_file,
+                        UniversalFileType.image => Symbols.image,
+                        _ => Symbols.insert_drive_file,
+                      };
+
                       if (item.isOnCloud) {
                         return CloudFileWidget(item: item.data);
                       } else if (item.data is XFile) {
@@ -309,9 +317,23 @@ class AttachmentPreview extends HookConsumerWidget {
                                 : Image.file(File(file.path));
                           default:
                             return Column(
+                              mainAxisAlignment: MainAxisAlignment.center,
                               children: [
-                                const Icon(Symbols.document_scanner),
+                                Icon(fallbackIcon),
+                                const Gap(6),
                                 Text(file.name),
+                                FutureBuilder(
+                                  future: file.length(),
+                                  builder: (context, snapshot) {
+                                    if (snapshot.hasData) {
+                                      final size = snapshot.data as int;
+                                      return Text(
+                                        formatFileSize(size),
+                                      ).fontSize(11);
+                                    }
+                                    return const SizedBox.shrink();
+                                  },
+                                ),
                               ],
                             );
                         }
@@ -321,7 +343,14 @@ class AttachmentPreview extends HookConsumerWidget {
                             return Image.memory(item.data);
                           default:
                             return Column(
-                              children: [const Icon(Symbols.document_scanner)],
+                              mainAxisAlignment: MainAxisAlignment.center,
+                              children: [
+                                Icon(fallbackIcon),
+                                const Gap(6),
+                                Text(
+                                  formatFileSize(item.data.length),
+                                ).fontSize(11),
+                              ],
                             );
                         }
                       }
diff --git a/lib/widgets/content/cloud_file_collection.dart b/lib/widgets/content/cloud_file_collection.dart
index 8b960ab5..ca308c8b 100644
--- a/lib/widgets/content/cloud_file_collection.dart
+++ b/lib/widgets/content/cloud_file_collection.dart
@@ -17,6 +17,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:island/models/file.dart';
 import 'package:island/pods/config.dart';
 import 'package:island/pods/network.dart';
+import 'package:island/utils/format.dart';
 import 'package:island/widgets/alert.dart';
 import 'package:island/widgets/content/cloud_files.dart';
 import 'package:island/widgets/content/sensitive.dart';
@@ -359,16 +360,6 @@ class CloudFileZoomIn extends HookConsumerWidget {
       }
     }
 
-    String formatFileSize(int bytes) {
-      if (bytes <= 0) return '0 B';
-      if (bytes < 1024) return '$bytes B';
-      if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(2)} KB';
-      if (bytes < 1024 * 1024 * 1024) {
-        return '${(bytes / (1024 * 1024)).toStringAsFixed(2)} MB';
-      }
-      return '${(bytes / (1024 * 1024 * 1024)).toStringAsFixed(2)} GB';
-    }
-
     void showInfoSheet() {
       final theme = Theme.of(context);
       final exifData = item.fileMeta?['exif'] as Map<String, dynamic>? ?? {};
diff --git a/lib/widgets/content/cloud_files.dart b/lib/widgets/content/cloud_files.dart
index 6717e2ba..c9d1bfe4 100644
--- a/lib/widgets/content/cloud_files.dart
+++ b/lib/widgets/content/cloud_files.dart
@@ -9,6 +9,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:island/models/file.dart';
 import 'package:island/pods/config.dart';
 import 'package:island/services/time.dart';
+import 'package:island/utils/format.dart';
 import 'package:island/widgets/content/audio.dart';
 import 'package:material_symbols_icons/symbols.dart';
 import 'package:styled_widget/styled_widget.dart';
@@ -35,16 +36,6 @@ class CloudFileWidget extends HookConsumerWidget {
     final serverUrl = ref.watch(serverUrlProvider);
     final uri = '$serverUrl/drive/files/${item.id}';
 
-    String formatFileSize(int bytes) {
-      if (bytes <= 0) return '0 B';
-      if (bytes < 1024) return '$bytes B';
-      if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(2)} KB';
-      if (bytes < 1024 * 1024 * 1024) {
-        return '${(bytes / (1024 * 1024)).toStringAsFixed(2)} MB';
-      }
-      return '${(bytes / (1024 * 1024 * 1024)).toStringAsFixed(2)} GB';
-    }
-
     var ratio =
         item.fileMeta?['ratio'] is num
             ? item.fileMeta!['ratio'].toDouble()