Help! We just bought a 2013 Tahoe LTZ, great condition, with 36k on it. Love it! We were disappointed to learn that this generation predated MyLink and the bluetooth does not work for music. But I undertsood the USB would. We have 4 phones in our family (I am the holdout to Android). My wife's iPhone6 plays music through the USB, as does my daughter's iPhone7+. My son just got an iPhone7 and when connected to the USB we get "This media is not compatible". Any clues?