Which file types are supported by Spotify?
.mp3, .mp4, .m4a and .m4r files are supported.
.m4p is supported, but these files are usually protected by iTunes. Spotify can’t play them, but will try to match them against the corresponding Spotify track.
.m4v, .3gp, .3g2 and .mov files will be imported, but will only be playable if they were originally exported as audio files.