How to recover storage from "Videos" pseudo app?

With the goal of recovering storage space, I attempted to delete the Apple TV App. This app was still taking up 490MB of “Documents and Data” storage after I deleted all videos I could manually delete (the TV app libray screen said “You don’t have any videos.”) However, deleting the TV app only changed it to “Videos” which still takes up 490MB of “Documents and Data” storage.

There is no option to delete this “Videos” pseudo app. As far as I can tell, there is no actual “Videos” app I can start from the home/search screens.

I also tried to locate the media file(s) taking up storage via iTunes. There was one file under “Movies.” There was no option to delete this file from iTunes. I think I uploaded the file to my iPhone via CopyTrans Manager. So I tried deleting the file via CopyTrans.

Now the file does not show up in iTunes or CopyTrans, but the “Videos” app still consumes 490MB of storage. How do I recover the 490MB of storage taken up by the “Videos” app?

I have a feeling this file was orphaned somehow because it was uploaded a long time ago on different versions of iOS/iTunes/copyTrans before the Videos app became the TV app.

I read syncing may result in files that cannot be deleted. Since I manually manage the media on my iPhone, all sync settings have been set to disabled.

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update: Now I have the same problem for the Music app: no files in library, but “documents and data” takes up 318MB of storage after I tried toggling the Movie sync on/off. Even though I only enabled syncing for movies there was a warning that the music would also be deleted since the library was empty. The music was deleted, but the storage was not…