Custom map In UMAP

Hello Forum (lurkers :P)

One of the info sites of a game im playing (entropia universe) has an interactive image map using UMAP

He uses a custom image as background and I was wondering how you could make it!
I have tried everything and still cant figure it out…

this is the image as backgroung:

Kind Regards,

May perhaps be related to .

/i can give you an example of a custom map i want to crate a map like this one , where can i import the jpg file into the map editor so it shows the jpg as an map in UMAP?
or does it need to be a cvs, kml file?