diff --git a/ios/Runner/Info.plist b/ios/Runner/Info.plist
index f33bc39..584aa71 100644
--- a/ios/Runner/Info.plist
+++ b/ios/Runner/Info.plist
@@ -58,6 +58,11 @@
 			</array>
 		</dict>
 	</dict>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsLocalNetworking</key>
+		<true/>
+	</dict>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>audio</string>
diff --git a/lib/core/env.dart b/lib/core/env.dart
index af6bded..264c94b 100644
--- a/lib/core/env.dart
+++ b/lib/core/env.dart
@@ -4,8 +4,10 @@ abstract final class Env {
   static const supabaseUrl = String.fromEnvironment('SUPABASE_URL');
   static const supabasePublishableKey = String.fromEnvironment('SUPABASE_PUBLISHABLE_KEY');
 
-  /// Public base URL of the R2 bucket (custom domain), e.g. https://media.nangakathai.app
-  static const mediaBaseUrl = String.fromEnvironment('MEDIA_BASE_URL');
+  /// Public base URL of the audio files. Defaults to the Supabase "audio" storage bucket.
+  static const _mediaBaseUrl = String.fromEnvironment('MEDIA_BASE_URL');
+  static String get mediaBaseUrl =>
+      _mediaBaseUrl.isNotEmpty ? _mediaBaseUrl : '$supabaseUrl/storage/v1/object/public/audio';
 
   static bool get hasSupabase => supabaseUrl.isNotEmpty && supabasePublishableKey.isNotEmpty;
 }