Before we did the android 10 update we were able to put our own notification sound for text messages now if you put a sound in for text messages it's the same sound for all notifications anyone got any ideas on how to resolve it I did ask when I was on beta test but the never did anything about it.
I'm still on Android 9 so can't check I'm afraid.
Can you double check yours via Settings-Apps-Messages-Press the Cog wheel-Notifications-New Messages-Sound.
See if you can set it that way.
If not then I'd suggest to send your feedback to the Samsung Developers via the Samsung Members App @Rob1257
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.