Can we record incoming USB stream to thumb drive

I’m trying to record a multitrack recording on to a thumb drive with my qu-16. We have backing tracks coming in to the stereo 1,2,and 3 input via the USB port. I’m able to record the mic inputs to the thumb drive, but the backing tracks are not being recorded. Is it possible? If so, what do I need to do? Thanks!

Yes - just route those tracks to the USB drive.

Probably section 9.7 of the manual - but I’ve got 1.7 in front of me for some reason…

It’s now section 10.7. Specifically the bit on page 54