I have seen lots of posts, and feature requests for this, but it is already available to do.
If you already have Spotify Installed
if you have the default app location set to the internal storage then...
go to Settings > System > Storage
select "This Device"
select "Apps & Games"
scroll down to spotify and select it
click on move and choose "SD Card"
depending on if you already have offline music it may take some time - be patient.
You will need to restart the phone when complete as Spotify wont open until you have.
If you havnt already got spotify installed
go to settings > system > storgage
temporaraly change the default app location to the SD Card
install spotify from the store
go back and change the new app install location to This Device
Hey there you,
Yeah, you! 😁
Welcome - we're glad you joined the Spotify Community!
While you here, let's have a fun game…