Update app.py

app.py

@@ -20,9 +20,11 @@ def invoke(openai_api_key, youtube_url, prompt):
     )
     docs = loader.load()
     shutil.rmtree(save_dir)
-    retrieval = docs[0].page_content
-    ###
-    return retrieval
+    content = docs[0].page_content
+    #####
+    #TODO
+    #####
+    return content
 
 description = """The app demonstrates how to use a Large Language Model (LLM) with Retrieval Augmented Generation (RAG) on external data. 
                  Enter an OpenAI API key, YouTube URL, and prompt to search the video, analyse its sentiment, summarize it, translate it, etc.