page-bottom is automatic. Once you view it, then it will show up at the bottom of every page until you hide it. But, you can hide it and, if desired, view something else in order to have different frames at the bottom of different pages. Whichever one is last viewed will display when the page-bottom is reached.
I.e., I *think* what you are wanting to do here is to display something at the bottom of the page only when you reach the last of. In that case, view the frame as you have, but then hide it again after the next page and make sure it is hidden before you reach the last of.