You need to add the map as a full attachment not a link to another site. It has to display as an attachment image. And if the proper image is not the first image then you need to put:

### Latest WIP ###

at the end of the text bit of your post so that the attached image is just under it.

Oh and then you have to wait until I run the script again which takes a while so I dont do it all that often. I think in your case people will get the general idea from the first thumb and click in and see the latest image if they want it. It would be nice to fix up those thumbs that are completely wrong or missing however but thats a CL job cos I cant edit all the threads.