Nexus 6P not reading USB OTG

I have two Nexus 6Ps, my original 64GB and another 124GB I just picked up. I've set them up as identical as I reasonably can. The original one has never had an issue reading the USB OTG and doesn't now. My newer one does - I get an error "Unsupported SanDisk USB drive". If I elect to format the USB drive it takes me through the steps but nothing happens, I still get the Unsupported message on the notification bar. Funny thing is if I use File Manager or one of the apps to read the files (my phone is rooted) I can see the files on the drive, no problem. However, through the Android Files app, I don't see the drive. I'm thinking it's a phone issue because I have no problem with the USB OTG on the other phone. Running the Pixel Experience 9.0 on both phones, rooted with Magisk. Can anyone point me in the right direction? Thanks.