Select a file from the ringtones folder as a ringtone
- Open Sounds & Ringtones.
- Tap Ringtone to open the list of tones.
- Tap a tone under My ringtones or System sounds. The tone plays briefly.
- To set the volume, drag the Ringtone Volume slider.
You pick the Alert Tone and Notification Tone the same way, under Alerts.
Checked against the LuneOS code and installed apps. Nobody has tried these steps by hand yet, so tell us if something differs.