diff --git a/lib/main.dart b/lib/main.dart
index e8f7989..ce55274 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -25,6 +25,7 @@ import 'package:vup/utils/ffmpeg/flutter.dart';
 import 'package:vup/utils/ffmpeg/io.dart';
 import 'package:vup/utils/special_titles.dart';
 import 'package:vup/utils/strings.dart';
+import 'package:vup/utils/temp_dir.dart';
 import 'package:vup/view/tab.dart';
 import 'package:vup/widget/app_bar_wrapper.dart';
 import 'package:vup/widget/vup_logo.dart';
@@ -105,7 +106,7 @@ Future<void> initApp() async {
       'vup',
     );
 
-    final tempDir = await getTemporaryDirectory();
+    final tempDir = await getTempDir();
     vupTempDir = join(tempDir.path, 'vup');
 
     vupDataDir = join(dataHome.path, 'vup');
diff --git a/lib/service/jellyfin_server.dart b/lib/service/jellyfin_server.dart
index bd4d6b7..d7b216a 100644
--- a/lib/service/jellyfin_server.dart
+++ b/lib/service/jellyfin_server.dart
@@ -17,6 +17,7 @@ import 'package:vup/service/jellyfin_server/statistics.dart';
 import 'package:vup/service/rich_status_service.dart';
 import 'package:vup/service/web_server/serve_chunked_file.dart';
 import 'package:alfred/src/type_handlers/websocket_type_handler.dart';
+import 'package:vup/utils/temp_dir.dart';
 import 'package:subtitle/subtitle.dart';
 
 import 'package:archive2/archive_io.dart';
@@ -2098,7 +2099,8 @@ class JellyfinServerService extends VupService {
             });
 
     app.get('/playback/bitratetest', (req, res) async {
-      final file = File('/tmp/${Uuid().v4()}');
+      String tmpString = (await getTempDir()).path;
+      final file = File(join(tmpString, const Uuid().v4()));
       file.createSync(recursive: true);
       file.writeAsBytesSync(
           Uint8List(int.parse(req.requestedUri.queryParameters['size']!)));
diff --git a/lib/utils/temp_dir.dart b/lib/utils/temp_dir.dart
new file mode 100644
index 0000000..d188f0b
--- /dev/null
+++ b/lib/utils/temp_dir.dart
@@ -0,0 +1,15 @@
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+import 'package:xdg_directories/xdg_directories.dart';
+import 'package:path/path.dart';
+
+bool get isRunningAsFlatpak => configHome.path.contains('app.vup.Vup');
+
+Future<Directory> getTempDir() async {
+  Directory tmpDir = await getTemporaryDirectory();
+  if (Platform.isLinux && isRunningAsFlatpak && runtimeDir != null) {
+    tmpDir = Directory(join(runtimeDir!.path, 'app', 'app.vup.Vup'));
+  }
+  return tmpDir;
+}
diff --git a/lib/view/sidebar.dart b/lib/view/sidebar.dart
index a5f2062..c003eb9 100644
--- a/lib/view/sidebar.dart
+++ b/lib/view/sidebar.dart
@@ -16,6 +16,7 @@ import 'package:vup/page/settings.dart';
 import 'package:vup/utils/ffmpeg/base.dart';
 import 'package:vup/utils/ffmpeg_installer.dart';
 import 'package:vup/utils/show_portal_dialog.dart';
+import 'package:vup/utils/temp_dir.dart';
 import 'package:vup/view/setup_sync_dialog.dart';
 import 'package:vup/widget/sidebar_shortcut.dart';
 import 'package:vup/widget/user.dart';
@@ -829,7 +830,7 @@ MimeType=x-scheme-handler/vup;
               ],
             ),
           ),
-        if (isInstallationAvailable)
+        if (isInstallationAvailable && !isRunningAsFlatpak)
           Container(
             decoration: BoxDecoration(
               color: SkyColors.warning,