You can upload local music to Spotify by enabling local file support in Spotify's settings, and choosing a folder to take music from.
If you have a Spotify Premium account, you can play local files on a mobile device too, though the tracks need to be in a playlist.
Adding local files to Spotify is a great way to play songs that you can't normally stream.
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Want to access all your music in one place? If you regularly use Spotify, you can play your personal music files — stored locally on your computer's hard drive — through Spotify, turning it into your music player for both streaming and local audio files.