Spring RTS Engine

Im modifying an existing map using Spring Edit. Everything seems to work as intended except that the preview of the modified map shows the preview of the original map. So im wondering what i need to do to update this preview image. I suppose this image is saved into the map instead of being dynamically generated by SpringLobby. Ive looked in SpringEdit but i do not think i see any option to generate this preview file.

Delete the cache folder in your Spring folder.

it uses the map hash, so if you change even one tiny bit it will regenerate the picture without deleting the cache file, but the refresh still needs to be done manually:
tools -> reload map/mod list