Slitherine

How do I go about getting an image to show up when players are browsing the scenario and click on the title in the menu?

good question - did not figured out myself yet.
I tried a few folder options but it seems the filelocation/path is coded within the .map file.
Maybe not supported yet.

It is interesting that the Campaigns & Historical Scenarios offer a screen shot of that particular play through;
but none appear for the Custom Scenarios. (disregarding the last one viewed per a Campaign or a Historical one)