This suggestion is not new, but seems similar others have been closed after the newest update that shows you the page number you are currently editing. We are targeting for an actual modification on the exported pdf.

Its a painful process to add page numbers manually in order to have them ready for printing. Goodnotes is very useful to merge several pdf documents plus your own production into one single document. Page numbering will be a hit, compared with other options that offer this kind of services under paid subscriptions.