I’ve googled this problem and dig through iOS settings, but I can’t find an answer. Anyway, I have an iPhone 8+ on my the latest release, but this happens on my wife’s iPhone 7 also. Whenever I am in the car I want my phone to connect to the in car Bluetooth so that I can take calls on the handsfree speaker in the car. The issue is if I let my son use my phone to watch something or play a game, the phone tried to export the audio through the car. Unless I disconnect the Bluetooth or switch the radio input to Bluetooth audio, he can’t hear anything. Is there a setting I am missing?