Denon AVR like console and music at the same time?

I connected my ps4 to a projector via a Denon AVR-X4400H receiver (via HDMI). At the same time, there's also a sound system on the receiver. The picture and sound of the PS4 are reproduced.
But now I would like to hear music played on the system on my mobile phone.
As soon as I connect my mobile phone to the receiver via AirPlay or Bluetooth, the picture changes to display the current track. If I then select the ps4 again, the music goes off again.
How is it possible to display the ps4 picture while listening to music?

I don't know exactly, but most of the time you only have one input channel active at the same time, either ps4 or mobile phone or another player. I haven't had an avr receiver that can play back two channels at the same time.

In the past, when you still had chinch inputs, that would have been possible. Then you had the picture from the ps4 and the music from the mobile phone with the appropriate cables at the same time.

Maybe you can still play the music somehow over the ps4?