There is a Permissions tab in Android....but this thread had documented that in Android on many different devices the Permission tab does nothing to gain access to the delete files request.
That's the nature of the thread.
On my Google Pixel phone for example.....my MSFT Word App is filled up with hundreds of duplicate files and old files that are not needed, but the delete function continues after several years of people posting here. Even with Permissions granted, while trying to delete files in the Word or Excel App the device still replies "You do not have permission to delete this file"
This is a known flaw with MSFT Office Apps and Android solutions...the files just keep piling up!
Would be nice if someone fixed this.....issue has been going on for years!