When I connect a USB-C monitor, I want to hear it through the IPad Pro built-in sound.

I connected USB-C monitor (DELL U2719DC) in IPad Pro 3rd Gen.

But I can't hear any sound though the IPad Pro built-in sound device.

As I know, Sound will send via USB-C devices when connect the USB-C devices.

Unfortunately, the Dell Monitor doesn't support speakers.

I want to hear the sound though IPad Pro.

Could you tell me know how to change the sound device when connect the USB-C monitor.