My phone stopped detecting custom notification sounds (but custom ringtone sounds still work??) I installed some custom notifications sounds on my android a few months ago and they've worked fine for a rlly long time until when recently all my notification sounds went back to default so I try to change back to any of the old custom sounds that I'd been using they won't show up in the options
My custom ringtone sounds didn't change and still work fine, but my notification sounds just won't show up I've tried rebooting, renaming, changing the location of the file(s), and clearing cache but nothing works idk what to do anymore 
its getting really annoying.

My phone is a BLU Advance 5.5 on Android ver 6.0
Any sound files stored in a folder named

Notifications


will be found by the system and displayed as an option for a Notification sound

Any sound files stored in a folder named

Ringtones


will be found by the system and displayed as an option for a Ringtone sound

Note that it doesn't matter where in the system your Notifications or Ringtones folders are stored, Android will still find them. Notifications in /media/notifications will be found, and so will sound files in /Music/Notifications. You can also have more than one Notifications or Ringtones folders.