So… what exactly is your suggestion? Something like a „save as“ button that lets you download a video to a custom spot on your mobile’s file system (or whatever spot might be accessible through the mobile’s file system / connected drives)?
There’s already an existing suggestion asking to expand the options where to download media to, including an option to download to places accessible to other apps. If that’s what you’re looking for, please comment/vote in that thread in order to help us avoid distracting or cannibalizing votes by having duplicate suggestions (in which case I suggest we close this thread).