How can I set the background image the same on all master slides without editing each master slide individually in Keynote? In PowerPoint the master slides have inheritance, so you can set common elements on all the master slides easily. I don't see anyway to do this in Keynote. For example, if I want to set the background image on all the master slides then I need to edit the background image on each master slide.

How to set the background image the same on all master slides without editing each master slide individually?
It appears the correct answer is I cannot do this unfortunately.