Try a clean install I'm running the latest tipsy and all my ringtones and more are avail
They were clean installs and I just did another one to confirm it to myself. On a clean install of Tipsy Phone ringtone and Default notification ringtone are defaulted to none. Default alarm ringtone is defaulted to Piezo.
When I select Phone or Default notification ringtone I do not get the radio button selection menu displayed in your pic, I have to use a file explorer to chose a sound file. Using solid explorer I am able to select the mp3 I use for my ringtone but when I select an ogg for the Default notification ringtone in /system/media/audio/notifications the selection does not stick but remains at none.
On a fresh install of Tesla, which I've reverted to for my main driver, there is a default set for all ringtones, but again selection is not through the radio button menu from your pic - and which I have seen in most other roms - but through picking a file with a file explorer.
I note that you seem to be using an 850 while I'm using an 851. Apparently there are differences in the image files.