Tx6 with Samsung Galaxy Note Ultra 20

I’m loving the TX6. One problem. I tried to record some video with it plugged into my Samsung Galaxy Note Ultra 20… the phone sees it as a USB input (in video pro mode) but gets no sound. I’ve tried every possible setting in tx6 (ins and outs, rate, etc). I’ve tried all developer settings in the phone, and other Pro camera apps, no joy.

This particular phone is really unreliable with USB audio in my experience, but really I’m here to ask: HAS ANYONE HAD SUCCESS WITH THIS COMBINATION? If you have, I’ll persist!

(I’d buy an iPhone but I won’t have anything that doesn’t take USB-C power!)