I'm working in the Maker version of SW. I'm not sure I'm posting in the correct place. 

I've tried everything I (and chatGPT) can imagine, but I can't get the tray in the attached zip file to follow the belt path when a pulley is rotated. Tried recreating it all in one top level assembly, tried every option in both the belt feature and the path mate, tried fixing the pulleys to a housing, tried running