I am having the same problem and I use the latest version of wp stateless. When I upload a video file through the frontend form, the video does not go directly to Google cloud storage instead it goes to local server. But if I upload an image file, it goes directly to Google cloud storage. Also if I upload a video through the backend media library it goes directly to Google cloud storage.
Wp-stateless does not handle video upload through the frontend form. Please solve this issue in your next update.
Also in your next update create an option under “synchronization” to “synchronize videos in the media library” and also create option in the media library to synchronize bulk of selected files.
