It's getting harder to create an MP3 file. I think I spent about 5 hours converting a single CD for my father, just to make the tracks appear on Spotify.
First I had to search for an MP3 CD ripper. None of the main players seem to provide it any more. The converter I chose was German, and they referenced an online database giving the CD tracks completely different names. So I had to rename them myself, that is, when I worked out how to do it. Spotify had trouble recognising 12 different tracks with a blank name, so I had to rename them, and start all over again, because I had to.
Once that part was completed, I placed the files in a local folder that I have selected for Spotify, and it refused to see them, mixed in with all the other old local music files that don't work any more; and then, they appeared thankfully. But I don't understand why they do or don't appear. No idea.
The point is: shouldn't Spotify provide the means to import CD tracks as part of the service? Or, if they allowed you use the Ogg Vorbis format, or FLAC, they could recommend Jet Audio, which does it for you.
Finally, I uninstalled my desktop Spotify with all it's layered updates, and then started again with a fresh new installation.
Posting up on here isn't straightforward, either.
A similar idea has been posted here: https://community.spotify.com/t5/Live-Ideas/Desktop-Local-Files-Support-More-Formats-AAC-ALAC-WAV-AI...
Please add your comments/votes there, and reach out here if you need any other help 🙂