MyG37 - Can't get AUX input to work

I recently bought a used 2013 G37 Journey and I can't get the AUX input to work so I can play music through my phone. Mine doesn't have a 3.5mm input, it only has a USB port. When I plug my phone into that the screen says "check connected device" and on my phone it's like it's trying to do a data transfer or something. Is there something I'm missing? Is something not working correctly? Do I need to get an aftermarket add-on to play music? I don't know if it's worth noting, because I don't know how many different variations of this car there was that year, but mine doesn't have Bluetooth or navigation or anything like that. Any help would be appreciated.