I just noticed that when you are located inside of a main category that has also subcategories and you want to add new resource, Xenforo does not ask you to choose appropriate sub-categories! When you are not in one of the main categories, Xenforo does ask you to choose sub-categories. I think thats a problem as I can see on my board, users are uploading to main categories instead to subcategories!! I know that you need to go to subcategory and upload resources from there, but other users are not like me and they do not know that. Maybe i am missing something but if am not, I would suggest to add this to next release.