Sort local files with "organize your music"

[Hakamiah]

Hello.

I am trying to sort my music into playlist and just discovered the "Organize Your Music" tool from Spotify which is great for my needs.

My issue is that my local files aren't shown, only the music I added to my librairy from Spotify. It is an issue for me since I just got into Spotify and don't have so much saved songs yet.

After some research my first action was to sort my music tags with Musicbrainz so all my music titles, artists etc. were right.

But even with this, the songs in my local files still appear greyed/blacked, unable to click on the artist or album of the songs.

Second action was to create a playlist of my local files and make the playlist available offline. Once it was done, I was able to save my local files to my librairy using the android app on my phone (not possible on desktop app), making the songs "white" compare to the "grey/black" from before.

Yet, when I use the "organize your music" tool, the songs I added to my librairy from my local files aren't shown.

Am I missing something or is there something more that I could do ? I spend an afternoon trying by myself before to ask the community, but maybe I am asking for something impossible.

Thanks in advance for the answers (and sorry for the unperfect english, not my mother's tongue).