Local Files not showing up in Spotify Desktop Linux

[doudoujack]

I can't make it to get my local mp3 showing up in Spotify Local Files.

I tried many times opening/closing with checking/uncheking the folder in the settings, I even tried deleting the local-files.bnk and starting the procedure all over again but nothing does ... I simply want my folder Home/user/Music to be added to Spotify.

Any hints? Thanks in advance!