I found the problem :)
I'd noticed that the S10 had some .nomedia files in some libraries, (note the S9 does not although it is running the same version - Android 9.0
One of these .nomedia files was in the Root folder of internal storage. Didn't know what they were for so Googled it - they are...
Thanks Hermes,
I have tried that, used My Files to make the folder then moved a sound file into it, then rebooted. No luck, doesn't make any sense.
BTW, I can add files to my Ringtones folder and they can be chosen (for Ringtone).
No matter what I do I can't get my S10 (unlocked) to read the Notifications folder for custom notification sounds.
Just got the S10 (previous S9 running Pie).
Everything sorted except one annoying thing.
I had a custom sound in the S9 that I used for Google Calendar events. Just added it to...