Help me understand infotainment / media What's happening???
bear with me!!

I have on my iphone a lot of downloaded music from Amazon Prime playable offline. When I connect my phone via the usb connector and select ipod in the media section on the car stereo, I can play the music but only if I control it on my phone and no song or album details etc are displayed in the car screen. What ever was played before is displayed not what is currently playing.

This is not great because I'm using my my phone while driving instead of using the steering wheel controls to select tracks music etc. However music downloaded to itunes does display on the car screen and can be controlled by the steering wheel controls.
Selecting USB option in the media section asks for a USB to be put in the USB slot. Thanks in advance