You should see a gray + appear, and if you keep sliding left it should turn green, at which point you can lift your finger off the screen. To do this, press your finger down on a song and slide to the left. You can also add these songs to your overall library so that you can shuffle these songs with your other music instead of having to play from the playlist to listen to the mixtapes (for some reason you can only do this in the mobile app as far as I know). Once the songs have all downloaded, your playlist screen should look similar to the one above. If the playlist of local files has a grey downward pointing arrow, that most likely means you should try a different Wi-Fi network. If no songs are beginnning to download, back out to the screen displaying all your playlists. Depending on how many songs are on the playlist, this process could take a few minues.

If the phone and computer are on the same Wi-Fi, the local files should begin to download into the playlist.

Click on the three dots in the upper right of the screen, and hit the Download option. Click on it, and it should be empty with Spotify asking you to add songs to it (Note: your playlist screen should be different from the one above, which has already synced the local files).

Go to your playlists, and you should see a playlist with the same name as the one you just created on your computer. Now head to the mobile app on your phone.

Logic welcome to forever download zip