My C7 has two USB ports. Only the one under the infotainment slide screen will play my music. The other one in the center cubby only charges.USB but it’s a one way street. You can load songs via USB but to delete tracks it’s managed on the device. In all fairness it’s a seven or so year old unit but still a great rig. Creative Labs make some excellent products. Any PC gamer who has been at it for a while would recognize the Sound Blaster line of PCI Sound cards although these days onboard audio has gotten quite good and most people just go with that. I did connect it to the car with USB but all I got was a charging icon on the player. Didn’t show up as a connected device.
I chose to rip my CDs to my laptop, copy them to a few "newest tech available" USB drives, and stopped
at that point.