1) In a dialog, "App was denied access to be default *** app",
there is (apparently) a link "Learn how to allow access",
but pressing the link doesn't do anything.
Can anyone suggest why it doesn't respond or, if not,
where it should go, so I can manually view it?
2) Once I selected Files as the "always" image viewer for GIF,
I discovered it can't produce a moving GIF, and I can't find a way to set this back to a proper GIF viewer.
An "always" choice won't present itself in Files or Material Files anymore,
and I don't see a "file association" place in Settings" where I could change it back.