Failure to write file

Having an issue with the editor writing the file to the download folder. I get a message "preparing your file." Nothing happens - the file is not written to download folder and the editor is in wait mode. Any help would be appreciated.

Can you provide detailed reproduction steps?

• What did you start from (existing file, created from scratch on editor)
• If existing, what version of the game does it come from, is it modded?
• What changes did you make in the editor? Did you try more minimal changes first?