Workshop Thumbnail

[ECKS]

I made some pictures for the levels I published, and I want them as my thumbnail. I have already tried editing screen.png, but when I go to update the level (Press publish again), it automatically overwrites as a screenshot of the level editor.

[holy SWAG]

That's not how you add workshop thumbnails.
To change thumbnails, go to your workshop map and click here:
https://gyazo.com/38c709ab8f7d5cb916ecfe78f59178ff
and add an image.
After you're done, press "save", and that's it!

[ECKS]

I meant that I was trying to add a preview image for when people find the map on the workshop and they see the image without clicking on it.

[holy SWAG]

I think its the same thing.

[ECKS]

I already tried adding an image that way. I can't seem to find any options to make it the thumbnail. http://prntscr.com/erq3w6

[holy SWAG]

Hm... No idea.
Check on google / youtube, maybe?

[ECKS]

Alright.

[Starfisher]

You have to use a picture that is less than 900 KB (I don't remember the exact number, but the less the best - I have used a 380 KB picture and next time will use a 188 KB pic. You have to close the game. Then find the campaign folder (it's where your covers, saves, mods - look for a "Level" folder). And you have to copy your screen.png into your campaign folder. Overwrite it.
Sometimes the game overwrites it each time with its own screen.png - in this case you have to right click your pic - Properties - Read Only. I didn't have to do this it worked fine for me.
After this you upload your campaign.

[Starfisher]

And don't edit the original scree.png. Just make your own pic, name (or rename) it screen.png and use it to overwrite the original.