Explorer App does not download the map layers

Hello,

I have installed the explore app on three devices. But only on one of them I can download offline maps. On both other devices the process hangs when it tries to download che map layers. So I am not even able to selecht the map that I would like ro get. I have installed and reinstalled the app but it doesn't help 

Is this a limit from the software that prevents offline maps on multiple devices? Or is it a matter of app permissions or a bug?

Best regards

Martin