How can I re-order the attachments for a meeting

I am trying to re-order these attachments within a meeting but they do not move. 

You can’t reorder the documents on the left-hand side, but the documents can be organized by agenda item.  

To move the document,  place your cursor on the icon at the left-hand side of the document name. Drag to the right and dropping in an agenda item.

If the doc has been dropped in the wrong agenda item, remove the doc (click on the x to its right) – it goes back to the docs on the left-hand side. Then drag it to a new item. Documents that are deleted from attachments remain in the main document section.