add print 4 upl mode

app.py

@@ -54,6 +54,7 @@ def audio2midi(audio_path: str, cache_dir: str):
 def upl_infer(audio_path: str, cache_dir="./__pycache__/mode1"):
     clean_cache(cache_dir)
     try:
+        print(audio_path)
         midi, title = audio2midi(audio_path, cache_dir)
         xml = midi2xml(midi, title)
         abc = xml2abc(xml)