Thumbnail states

[Gordon Dry]

As mentioned here: How to add Custom Menu Icons to (almost) any Asset

To finish I'll mention that you can actually add different icons for the hover and active states, because the auto-generated ones are kind of ugly, but, that's beyond the scope of this guide, for now. It works in a similar way except you have to add more icon images to the import folder, and give them the right names. The information how to do it is available in the Paradox forums.

So where do I find these informations?

 

[Shelltoe]

to answer your question and your last workshop comment:
http://forum.paradoxplaza.com/forum...w-image-within-the-game.843045/#post-19059042

"_thumb_hovered, _thumb_disabled, _thumb_focused, _thumb_pressed"

i don't think the search function sucks though, as it actually finds the info you asked for instantly:
https://forum.paradoxplaza.com/forum/index.php?search/57872/&q=asset icon hover&o=date&c[node]=877

 

[Gordon Dry]

Okay.
I searched for thumbnail and thumb.

btw I got it working in my asset, have to do some fixes in the asset itself before uploading though.
Nice PaintShop Pro Presets with several layers and layer groups are now on my drive.