external card offline music disappearing

[user-removed]

Hi Spotify,

I have regular problem and even though I doubt it can be solved I am so tired of this I am trying to find answers. Already looked on forums etc.

I have my offline albums on external card. When I connect my phone to PC/Mac all the offline music disappears instantly and I think it remains there somewhere reducing further my card capacity. 

Is there some way how to solve this? 

I can´t have offline music on phone memory, it is too small. 

Thanks

Mark