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Moto G (3G) Android 6.0.
Not really. But I think I've done it. Fuck me it was hard though. The one time I want more shit on my phone...!
combo of this page 6
https://community.spotify.com/t5/forums/v3_1/forumtopicpage/board-id/spotifyandroid/page/6/thread-id/25140and the main answer here: https://community.spotify.com/t5/Android/Downloading-music-to-external-SD-card-another-one/m-p/687624/highlight/false#M25138
What phone & OS? I'm not that tech-savvy, but couldn't you install spotify as an apk to whereever you want?