I wish I could join but I am too new.
Itch only accepts game archives. As I understood with the previous project, you need to archive the game folder (right mouse button>archive>!AND BE SURE TO MAKE IT A ZIP IN THE ARCHIVE SETTINGS).I tried only with the web, so it is advisable to spend a day or two to publish the game, as you may have many problems.I hope it helpedV●ᴥ●V
File - export - select the desired format (in this jam Windows) - you will have a folder, right-click - select "add to archive" - in the archive, be sure to change the format from RAR to ZIP - go to itch, click "new project", download the game archive. BUT! I don't know what maker you have, the instruction that I gave above I tried only on RPG Maker MV, whether this instruction will work on others I really don't know.