Update app.py

app.py

@@ -2496,11 +2496,16 @@ def similarity_matching(sprites_data: dict, project_folder: str) -> str:
     # =========================================
     #  Copy matched backdrop assets + collect
     # =========================================
+    # =========================================
+    #  Copy matched backdrop assets + collect
+    # =========================================
     backdrop_data = []
     copied_backdrop_folders = set()
     for backdrop_idx, matched_idx in enumerate(most_similar_indices):
-        matched_image_path = folder_image_paths[matched_idx]
+        # FIXED: Use the correct variable name
+        matched_image_path = IMAGE_PATHS[matched_idx]
         matched_folder     = os.path.dirname(matched_image_path)
+        # ... rest of the loop
         matched_filename = os.path.basename(matched_image_path)
         
         # CHANGED: use our new normalized backdrop_base_path