A number of times I have experienced the following:
- I place a couple of mp3 files in the folder Notifications
- I change sound settings so as to use some of these custom notification sounds
- After a while (days, weeks?) my custom notification sounds are 'reset' and many of these custom mp3 files appear to have been removed from the Notifications folder
- I have a feeling that GOS updates may be the cause of this. Could it be that GOS updates remove suspicious mp3 files from the Notifications folder?