I just found that there is no override permissions tab in the add a file or website setup page. I was thinking of making a file (with answers in it) available to only some roles, but this was not possible. I don't want to use hide/show as assigning permission to view hidden stuff is overkill - its meant for some files, wheras others I want to keep hidden.

Could an override permissions and locally assigned roles bit be put here with just view permissions there?