My 2017 Colorado does not have a CD player. I plugged my thumb drive into the Colorado's USB in-dash port. The system does not recognize it as an AUX device. Same for my ipod with the 3.5 mm peg. I can play music from the same thumb drive and ipod in my Toyota RAV4. Went to the Chevy dealer and their tech guy could not get it to work either. Hmmmm. Could it be a formatting issue? FYI, there is a company called Automotive Integrated Solutions that makes a plug and play USB CD that is compatible with the Colorado's entertainment system software ( and other vehicle) and can be controlled with the factory on screen controls. Problem is the unit costs $349.... a lot for a CD player. I am passing on buying one. Any suggestions from 2017-2019 Colorado owners on how to get thumb drive to work?