Adding Local Files to Playlist

[recursivesauron]

Hello!

I've been having a little trouble adding local files into a playlist to make them available for listening offline. I know I've added the source successfully because when I search the specific album name from my local files the search gives two correct results with the "local file" icon. The issue however, is that this album had around 40 tracks, and the search only showed around 2.

Is there a way to more easily display known local files with Spotify to make creating local playlists easier? Perhaps there's also a specific naming/file propery convention that has to be followed for local tracks to be easily searchable?

Thanks!