Downloaded video metadata - URL?

So when downloading videos in Aloha Browser on my Android phone, I can always access the "Source page" URL from where the video was downloaded by pressing the video's three little dots, giving me the option "Open source page". Where exactly is that URL stored? Is it bound to the video file itself? Or is it only localized within the app, so to speak?

I kind of got my hopes up that it was stored in the metadata of the video file somehow, but running a downloaded video file in e.g MediaInfo, I find no such data.