A: When a page is moved around the flatplan and then refolioed we create a new PDF. However we store the assets related to that page in our database using a unique reference number (URN). Once a page lands on the system the URN is attached to that page and all its related assets regardless of its final position in the flatplan and eventual folio number. This means the correct PDF is always dispatched to the printer. A new URN is only created if the page is sent down from indesign again.