(I'm assuming you're on a pc because i know nothing about mac computers.)
You can drag it to a new folder anywhere in your computer that's remotely easily accessible, and label it something like "spotify". really dosn't matter. then go into spotify and click [ctrl + p], or; edit > preferences. then scroll down until you see a heading labelled "local files", it is the second from the bottom. at the bottom of this section, click the "ADD A SOURCE" button and navigate until you find your folder with the mp3('s), click it, then click ok. then make sure that in the list of sources, the one you just added has the green switch beside it, if not then click the switch. at the top, go to file > exit. open spotify again, then go to "local files" at the main navigation menu on the left, and find your song('s). from here, continue with steps 3-6 in my answer above.
=>if your songs aren't in local files, make sure they are not in a zip/rar file, if they are extract them to the folder you made.
hope this works, let me know if you have any other questions
I honestly think that Spotify should get Chance's & Jeremih's newest Christmas mixtape for streaming because those songs are just as good as his previous mixtapes and it would allow Chance a bit more exposure into Spotify
Hey, You have to save it to your song library from your computer. Save it there if you have your entire song library to automatically download. Otherwise, what also works is to save them all to a new Playlist and then on your phone you click the three dots for the Playlist itself in your "playlist" library, then you should see download at the top of the popup menu.