
I cannot find anything that says settings. I have downloaded 3 playlists and they have the green arrow. Those are all good questions! Let's take them one by wrote:

(sometimes even if you have 500MB-1GB available) Spotify will stop downloading songs when the device you are using has a small available storage.

If you have marked a playlist as Available Offline, and songs won't download (no song has the loading symbol and they have a gray arrow next to them) then try deleting apps and stuff you don't need and maybe that helps. You won't be able to play songs you haven't downloaded, and you won't be able to search for songs until you deactivate the Offline Mode. (Just on the Spotify app, all the other apps will work just as they should) That way nothing involving an internet connection will get in or out. To ensure you aren't using any mobile data, go to Spotify's settings, and activate "Offline Mode". When you download all your songs you can start playing them without an internet connection. If it is gray, it means it isn't downloaded.

Songs that are already downloaded, will have a green arrow symbol next to them. I reccomend you to do this while you are connected to a Wi-Fi, since a connectionis needed to download them. When you do so, songs within the playlist will start downloading to your phone, one by one (The currently downloading song will have a loading symbol). To make songs available for offline use, you must turn on the switch to make a playlist available for offline.
