I have a Nexus 7 tablet with Android 5.1 installed although I think the problem pre-dates this. I was asked at some point whether I wanted to print a file attachment or open it and then if I always wanted to do the same thing with a file attachment. I accidentally clicked on 'always print with CloudPrint'. I now find that I cannot open any of my mail attachments or indeed any documents at all, wherever they have come from. When I click on them they all go straight to CloudPrint. The only documents I am given the option to open are PDF ones. I have tried disabling Cloud Print and looked in general settings but can't see a way to resolve this. Please help.