We are receiving reports from multiple users saying that their mobile app isn't showing album covers in Your Library. This is being investigated. If you're experiencing this issue, make sure to add your +Vote to this thread.
Thanks for your patience while we looked into this issue.
We’re happy to say that this should now be fixed for everyone! Just make sure your app is updated to the latest version.
If you're still having trouble, make sure to post a new thread in the relevant help board here.