Update app.py

app.py

@@ -34,7 +34,7 @@ assert AZURE_ACCOUNT_NAME is not None and AZURE_ACCOUNT_NAME != ""
 fs = AzureBlobFileSystem(account_name=AZURE_ACCOUNT_NAME, account_key=AZURE_ACCOUNT_KEY)
 # Retrieve the documents name whose indexes are stored
 path_list = fs.ls('gpt/storage_demo')
-documents_list = [Path(path).name[:-4] for path in path_list]
+global documents_list = [Path(path).name[:-4] for path in path_list]
 
 def construct_index(doc):