[Plugin: MapPress Easy Google Maps] combining multiple maps

I want to have a map that compiles all of the maps I created for individual posts so that you can browse through them on a single map.

This seems like it should be easy, but right now I can’t even get my existing maps to be listed for a new post. So each post currently has its own map. When I create a new post the only option is to create a new map – not add to existing ones.

Am I missing something?

http://ww.wp.xz.cn/extend/plugins/mappress-google-maps-for-wordpress/