proper use of API

app.py

@@ -203,7 +203,7 @@ with gr.Blocks() as demo:
                                 if not env_df.empty:
                                     user_id = env_df.iloc[0]["user_id"]
                                     model_id = env_df.iloc[0]["model_id"]
-                                    video_path = hf_hub_download(
+                                    video_path = API.hf_hub_download(
                                         repo_id=f"{user_id}/{model_id}",
                                         filename="replay.mp4",
                                         revision="main",