Objects disappear when reapplying a masterpage

I have set up a masterpage for use in a long report containing hundreds of tables and diagrams. I have used fitting options to have the object ( diagram placed from a pdf) size proportionally at a click when placing the object. This workes fine, but the dotted frame (from the master) disappear. If I for some reason need to go back, I have no placeholder to reference my object. I cannot find how to make it reappear? If I try to reapply the masterpage again, the placed object disappear and I have to place it again from start (Ctrl+D).

Is there an answer to this, or do I just have to adjust my "workflow" to overcome this problem? The aim is to place very many diagrams without having to manually adjust/size them all.

Thanks