Range rover sport meridian hi fi doesn't browse music on spotify

[lucpier]

Hello,
I am testing both apple music and spotify premium on my range rover sport my2016
With meridian 825 W system and find spotify sound quality better..
Anyway I am getting "crazy" because when I browse music I find what I have in apple music only,
So that I have to choose music in spotify directly on my mobile (iphone 6 with latest sw).
In apple music I can browse both music downloaded from the app and the one I get through icloud library (i mean all albums and playlist I already had in itunes) while in spotify other than listening I can't browswe albums and playlist even if setted in off line mode.
All this happen with the iphone connected to usb; in bluetooth it is no possible to browse music at all...

moreover everytime I get into the car apple music starts first, even if the last time I was listening to spotify!
What I am missing?