Yes, as far as I know it's no longer possible to keep that dialog from coming up every time. (but you could certainly write to Google or your phone maker to complain about that)
Thanks - will see if we can get this one working for us too (though I'm a little wary that it might actually make things worse on some of the Chinese Android forks, which tend to police this stuff even more than Google does).
That doesn't seem to be a permission that apps can request in their manifest, as far as I can tell. It does seem to be a permission you can manually grant through ADB, haven't tested it but research suggests that running:
cmd appops set com.pleco.chinesesystem PROJECT_MEDIA allow
in the ADB shell on your device would get rid of the permission dialogs.