UHS-II is backward compatible with UHS-I. It will work, but you won't get the speed. You'll still be limited to 104 MB/s. So far as I know, all Samsung phones, including the Note 9, are UHS-I.
"OK Google" (bling) "Uninstall Google Assistant."
She'll tell you how to disable her. Please be sure to turn off "Google Voice" on that settings page before turning GA off. On my Note 8, I have to do that or "OK Google" is still active, and I can't get to that setting after GA is disabled...