Bluetooth on UQ

Hi

I have a first-gen UQ and considering an p/ex and purchase of a new one, latest spec.

For the Bluetooth functionality, if you are using a phone which is paired with the UQ and you start to play, does the unit automatically switch to the BT input or do you need to select the input first (via app or remote)?

Asking because the rest of the family would find it much easier to use if it just did automatic switching when the phone(s) started to stream.

Thanks