How to put custom map?

[Hawt_Gae_Zx]

Hey I draw maps and wanted to somehow put it in the game? Is there some sort of tutorial to do that? I have seen stuff on the workshop?

[RUSO]

You need to select the tab where you load and save your maps and then click import to steam, then first click load and then click go to steam, and then finally click upload to steam. This is how I uploaded my mod. I have no clue on thumbnails sadly.