From what you're describing, it sounds like you need your users to be able to comment on categories and combine multiple files in one group. There is no option to make replies to an entire category, but you can reply to individual files.
Originally Posted by Sharg
I think it is not possible with this product. It will allow you to create great personal albums, but not place them in the categories. I wish it could.
Yes, it is. You can set any category to allow your users to create sub-categories under.