update

app.py

@@ -639,6 +639,7 @@ def download_urdf(asset_dir: str, req: gr.Request) -> str | None:
     if not asset_dir or not os.path.isdir(asset_dir):
         gr.Warning("Please select an asset first.")
         return None
+    gr.Info("⏳ Preparing URDF asset for download, please wait...")
     ensure_hf_files([f"{_rel_dir(asset_dir)}/**"])
     zip_path, uid = _fmt_zip_path(asset_dir, "urdf", req)
     _zip_items(zip_path, [(asset_dir, "")])
@@ -652,6 +653,7 @@ def download_usd(asset_dir: str, req: gr.Request) -> str | None:
         gr.Warning("Please select an asset first.")
         return None
 
+    gr.Info("⏳ Preparing USD asset for download, please wait...")
     rel = _rel_dir(asset_dir)
     stem = _find_urdf_stem(asset_dir)
     if stem is not None:
@@ -683,6 +685,7 @@ def download_mjcf(asset_dir: str, req: gr.Request) -> str | None:
         gr.Warning("Please select an asset first.")
         return None
 
+    gr.Info("⏳ Preparing MJCF asset for download, please wait...")
     ensure_hf_files([f"{_rel_dir(asset_dir)}/mjcf/**"])
     mjcf_dir = os.path.join(asset_dir, "mjcf")
     if not os.path.isdir(mjcf_dir):