"I did create a post on the timeline and it shows up there, but not here." 

Are you using the "update" part of the timeline? Timeline updates for videos and photos do not get put into the videos app or photos app. Those timeline posts are only visible in the timeline, not on the view videos page or the view photos page. That is why the "create post (context)" form was developed. (unified post form)

una (dot) io/page/view-discussion?id=1093