fix #117

lib/main.dart

@@ -30,6 +30,7 @@ void main() async {
 
   apiProvider = ApiProvider();
   twonlyDatabase = TwonlyDatabase();
+  await twonlyDatabase.messagesDao.appRestarted();
 
   runApp(
     MultiProvider(

lib/src/database/daos/messages_dao.dart

@@ -104,6 +104,20 @@ class MessagesDao extends DatabaseAccessor<TwonlyDatabase>
         .write(updates);
   }
 
+  Future appRestarted() {
+    // All media files in the downloading state are reseteded to the pending state
+    // When the app is used in mobile network, they will not be downloaded at the start
+    // if they are not yet downloaded...
+    final updates =
+        MessagesCompanion(downloadState: Value(DownloadState.pending));
+    return (update(messages)
+          ..where((t) =>
+              t.messageOtherId.isNotNull() &
+              t.downloadState.equals(DownloadState.downloading.index) &
+              t.kind.equals(MessageKind.media.name)))
+        .write(updates);
+  }
+
   Future openedAllNonMediaMessagesFromOtherUser(int contactId) {
     final updates = MessagesCompanion(openedAt: Value(DateTime.now()));
     return (update(messages)

lib/src/providers/api/media.dart

@@ -27,7 +27,7 @@ Future tryDownloadAllMediaFiles() async {
         MessageContent.fromJson(message.kind, jsonDecode(message.contentJson!));
 
     if (content is MediaMessageContent) {
-      tryDownloadMedia(
+      await tryDownloadMedia(
         message.messageId,
         message.contactId,
         content,