Does Facebook downloads the video from the url, specified in `file_url` parameter when creating an advideo?

Question

I am trying to create an advideo using Facebook Marketing GraphQL API and I am wondering about two things:

1. Does FB saves the link to the video specified in file_url or downloads the video from that URL and saves it somewhere in Facebook storage.
2. If you specify the source parameter as encoded video, you don't need to specify the file_url parameter, right?

My questions are based on this doc: https://developers.facebook.com/docs/marketing-api/reference/ad-account/advideos#Creating

Answer 1

1. Every ad video is saved by, and served from the servers of, Facebook. You can easily test it yourself; create an ad video with file_url provided, then check the source property (not to be confused with the property of same name when posting to the edge) of the newly-created video: it will point to a Facebook CDN address.
2. Yes, that's correct.