Saving offline music to sd card

[finnmarius]

I'd like to save my music to my sd card rather than the phone's (Wileyfox Spark X) internal storage. The guide Spotify provides says to go to your library -> settings -> storage. The problem, however, is that there is no storage setting in my app at all. I have tried un- and re-installing the app, to no avail. Any suggestions/tips are more than welcome!

EDIT: I'm using a very decent Lexar micro sdhc, so I doubt that could be the problem.