I have tried many flash drives (2.0, 3.0, and 3.10) and MP3 players formatted with all the available formats (FAT 32, NTFS, FAT and ExFAT nothing worked. I am at the end of my rope trying to get this issue resolved. Called GMC help, contacted the dealer and even tried OnStar. No one had any resolution for me to try. All the flash drives I tried in this vehicle (that did not work) worked perfectly in my 2017 Ford F150. Very disappointed in the service I have been getting from the GMC folks. For what we pay for these vehicles they should send a tech out to our home and trouble shoot this issue and resolve it. I recently completed a review I received from GMC (a few weeks ago) and I wish it hadn’t came when it did because if I received it now it would be a totally different review. The best I could give them now would be your service SUCKS. Should have kept my Ford.