As I have mentioned previously, a big change in vBulletin 4 involves the attachment system. I am currently working on a system that allows you to quickly reuse attachments through vBulletin and vBulletin products.

.. and so I have done a run through of the current state of the system for you to view.

If you didn't notice, this uses javascript, a lot of javascript, so if you don't have javascript enabled, then you will fall back to the familiar vB3 upload form.