Trying to use BT Cloud on Android. I go to attach a file to an email in Gmail but can't manage to get past log-in. The BT Cloud app asks me to log in when I select it as source of attachment. But as soon as I go back & select BT Cloud for attachment it asks me to log in again, so I never manage to get to a file & attach it! Can someone help me work out how to stay logged into the BT Cloud Android app for long enough to get into it & find the file to attach?!