Professional Plan and dropbox storage

Hi, I've just upgraded to the Professional Plan and created a free dropbox account. I've linked my rekordbox to dropbox and chose to store my entire collection. It copied my music to the dropbox folder on my pc, but upon uploading it I get the message saying I've ran out of Dropbox storage space at 2Gb. 
What am I missing here regarding activating the umlimited storage that comes with the Professional Plan?