I need help with notification sound with my OnePlus 8 Pro, especially with SMS messages and Viber incoming chat messages. I have tried all diifferent methods known to me, even clearing the apps cache and data in storage. I uninstalled and reinstalled the apps so many times and still the notification sound I pick does not work. I constantly shift from default sound to none, then from sound to other sound but get the same result each time, no notification sound coming out from my phone. I've done factory resets many times, but I still get no notification sound for SMS and Viber apps. To be clear, I do see the notification popups on the notification panel all the time and all other voice calls, ring tones and media sounds work normally. I need help please!