Oh whoa! I thought I unchecked that... thanks for the heads up!!! Sorry, for the confusion you are totally right! I'll fix that right now!!
EDIT: I'm so dumb! There's a box (for the host) that allows for editing changes/allowing uploads and I actually did have it unchecked (which I thought was correct) but it turns out you have to check it to disable new uploads! I can't believe I had those switched around... sorry!