WhatsApp pausing all audio on iPhone from ios
Hi
My suggestion is go to -> settings -> sound and vibrations -> seperate app sound
If you have that option that is, you will be able to choose what app sounds goes to the Bluetooth Device.
Also YouTube stops the audio when the phone goes to standby. [Premium YouTube can continue while the phone is in standby]
Also Also the app may override the audio playback when other audio apps is in use etc.