Specifically, I'm using Zello and want to change the notification sounds to make them work better with my bluetooth headset, but potential answers probably will be applicable in many cases.
Using Dexplorer, I was able to locate the specific *.wav file inside the internal folder structure of the app. Dexplorer however doesn't seem to offer an option to replace these files. Is there any way I can achieve this, meaning replacing the current *.wav file with a file of my choice?