[Q] How to change a notification tone by a root browser?

Ok I use the facebook group app quite a bit , but the notification is way to low

I converted it to system app and was going to change the tone to something different but I cant find the original one to swap it with in any of the sub folders etc

can someone help me out please

Opera Mini Browser?

Any sign of the Opera Mini browser being ported across? Obviously there is a version for the Gear S but no mention that I can find of it for the S2