Local files

Next, head over to your Local Files listing in Spotify. This is going to show you all of the files on your computer that you can sync over to the Spotify app.

There's a total at the top, and if it seems off, go into the Preferences menu and make sure the folder where you keep your music is included in the local files checklist. Because I had my iTunes music folder in a location other than the default, I had to add it to Spotify manually.