I am unable to upload a demo game. It is in .quest format. I browse to it, click upload, and then after a few moments it just says "Failed to load file". I tried redoing the .quest file to no avail.

Seems to be specific to this one game, so I am uploading it here (renamed to .zip), in the hope someone can shed some light.

It's because your game file doesn't load. When this happens, try seeing if it loads in Quest in the first place. This game generates the error:

Failed to load game.
The following errors occurred:
Error: Error adding script attribute 'equip' to element 'shield': Missing '}'

Thanks, that was it. It did not object when I played from edit mode, so I assumed it was okay.