I just switched to the s10 from a Pixel. Jury is still out for me. One issue I have is the inability to change notification sounds per app. Mostly the Google Messages app. I did uninstall and reinstall and still no luck. I know this was an issue for others. What else could I possibly be missing? I have a few different apps that I would like to apply different notification sounds too.
I just got into the S20 and had this same problem! Try this and see if it works (if you haven't found a solution yet).
Go into the app notifications, and long press on "general notifications". That should bring up a menu that will allowed you to change sounds.
You'll have to do it for all the categories youuyou want changed under "Notifications". I hope this helps, despite the difference in phone "numbers"!