If i can ever get it to play music in the car i will be happy to let you know. My JVC KW-V30BT in my truck wont see it as a media device, but it does see it as a phone. both the phone and the radio have options for bluetooth input/output, the radio has one for phone calls, and one for media, and the phone has calls, media, and input devices that i can check under the radios pairing.
My old galaxy s4 i had to enable the media in the radio to make it work, and then it worked fine, but the g4 i dont even have the option to enable the media in the radio, i only have the off button highlighted not the on, phone calls has both on and off highlighted.
not sure if it is a android version issue, maybe a bluetooth streaming type issue, been looking for anything that can fix it and get it working like the s4 did. thankfully i can still use the aux port, but i like the bluetooth more.