Update app.py

app.py

@@ -240,8 +240,10 @@ def update_board_():
     data_list = []
     for file in glob.glob("./m_data/model_data/external/*.json"):
         with open(file) as f:
+            print(f'trying to read external submit file: {file}')
             try:
                 data = json.load(f)
+                print(f'succeed to read: {file}, got {len(data)}')
                 data_list.append(data)
             except Exception as e:
                 pass # data was badly formatted, should not fail