I'm using LG G4 and I can't access my files because of screen overlay, what to do?

The problem says "can't access camera, storage, audio, files, go to app settings to change permission" and whenever I go to app settings to allow permission, it tells me again to "open settings" where in fact I'm already in settings. Almost all my apps are requesting permission and I can't figure out how to solve it. I'm a student and I badly need my files to open and send. Please help.

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