Amazon music playlist disappears when phone is connected to the car

pixi

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Bear with me and apologies if this has been done to death, but I'm still slowly learning all this tech stuff that I now have access to.
So, I have Amazon music App and my phone has been added to the Husband's prime account, great! I have downloaded a couple of albums and can see them nicely on the playlist when I'm sat inside the house.
When I get in my car and plug my phone in via the cable port in my wireless box in order to get Android Auto on the Smartphone interface, I select amazon music on the MMI and my playlist disappears so cannot be played through the App on the MMI.

What am I doing wrong? My phone auto connects Bluetooth all ok, can see everything else like phone numbers etc. I found out the albums I thought I was playing was just me streaming music using all my data! Is there any hope for me? :help: