@Yokora: Thanks for the tip and taking the time to make the post/vidoe.

If you want to fix the "no/black thumbnail" bug, simply save the game, exit without saving, and reupload it to the workshop. For some reason, it only takes a screenshot for the thumbnail if you use the save button. It doesn't take one if you save on exiting the map. If you didn't understand, head to this page that also explains it: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=298226112

Thank you and thank you again. :)

I like your work man, you can use my recycled symbol in your map.