diff --git a/mnemo_cards_backend/lib/api/v2/packs_api_v2.dart b/mnemo_cards_backend/lib/api/v2/packs_api_v2.dart
index 6d6b381..7e4032f 100644
--- a/mnemo_cards_backend/lib/api/v2/packs_api_v2.dart
+++ b/mnemo_cards_backend/lib/api/v2/packs_api_v2.dart
@@ -132,13 +132,16 @@ class PacksApiV2 {
   }
 
   /// Validates if a string is a valid UUID (object ID in MinIO)
+  /// Supports UUID with optional file extension (e.g., .mp3, .wav)
   bool _isValidUuid(String? value) {
     if (value == null || value.isEmpty) return false;
-    final uuidRegex = RegExp(
-      r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$',
+    final trimmed = value.trim();
+    // UUID with optional extension: UUID followed by optional .extension
+    final uuidWithExtensionRegex = RegExp(
+      r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}(\.[a-z0-9]+)?$',
       caseSensitive: false,
     );
-    return uuidRegex.hasMatch(value.trim());
+    return uuidWithExtensionRegex.hasMatch(trimmed);
   }
 
   /// Generates presigned URL if value is a UUID (object ID), otherwise returns null