update prompt for file names

app.py

@@ -799,6 +799,7 @@ PREFIX = """Answer the following questions as best you can with detail informati
 You can always use tools to convert text to sound.
 You must always check vector database first and try to answer the question based on the information in vector database only.
 Only when there is no information available from vector database, you can search information by using other tools.
+When the final answer has output files, you must output the **name** of the file.
 You have access to the following tools:"""
 
 PREFIX_2 = """You are a helpful AI assistant. You are capable to handle **any** task.