My Movies & Tv app keeps saying I'm not authorized to change the file. Can anyone help?

[Mythical Ronin]

Im trying to trim videos and it keeps saying try to save a copy which is what I'm doing. Windows 10 home, I've reset admin privilege's, both to computer and individual files, restart, reset, repair'd the application, restarted and shut down my computer and occasionally that fixes it but then it does the same thing seconds later. Anything else I can do to fix this?

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