Also worth checking is that when you click the button, a pop up may... well, pop up asking if you want to grant permission to view for players who aren't assigned to be able to view it currently, if you don't allow them the access they won't be able to view it. If unsure, open the handout etc and click edit, make sure the people who are supposed to be able to see it are represented in the 'in player's journals' section, either as themselves individually or the global 'all players' option.