Fix 3-band TIFF channel sorting bug caused by Gradio tmp dir paths

app.py

@@ -536,12 +536,16 @@ def run_super_resolution(image_path, model_choice, progress=gr.Progress()):
         if not all(p.lower().endswith(('.tif', '.tiff')) for p in paths):
             raise gr.Error("When uploading multiple files, all must be TIFF files.")
 
-        red_path = next((p for p in paths if "B04" in p.upper()), None)
-        green_path = next((p for p in paths if "B03" in p.upper()), None)
-        blue_path = next((p for p in paths if "B02" in p.upper()), None)
+        def get_basename(p):
+            return Path(p).name.upper()
+
+        red_path = next((p for p in paths if "B04" in get_basename(p) or "B4" in get_basename(p)), None)
+        green_path = next((p for p in paths if "B03" in get_basename(p) or "B3" in get_basename(p)), None)
+        blue_path = next((p for p in paths if "B02" in get_basename(p) or "B2" in get_basename(p)), None)
 
         if not (red_path and green_path and blue_path):
-            paths = sorted(paths)
+            # Sort by filename (not full path, to avoid Gradio temp dir randomness)
+            paths = sorted(paths, key=lambda p: Path(p).name)
             blue_path, green_path, red_path = paths[0], paths[1], paths[2]
 
         try: