I think what Luca means is that if he enables it site wide, then it will show for all new files uploaded by all teachers (not their previously uploaded ones, as it won't change for existing files) And I think he only wants it to automatically show in one course or category (maybe so the teacher doesn't have to remember themselves to tick the box?) I don't know of a way but presumably Dominique's suggestion of Additional HTML will work? (I'm not a coder so wouldn't know ;) )