Note: With multiple Distribution Centers, select the one you are sending orders to by clicking the Make Default button as seen below.
Scroll to and select FTP, set the Mapping you setup before (xml in our case), and set Bidirectional to yes.
Important Note - Order Status
Only orders in the Shipping stage for the given Distribution Center will be picked up. Orders created before the distribution center was setup or selected as the default one will not be downloaded unless you move them to the correct Distribution Center.
You can view what stage your orders are in and what distribution center they were sent to from this UltraCart page: https://secure.ultracart.com/merchant/orderProcessingMenu.do