Lay out the book and print a test copy
The book is your photos laid out as pages, in reading order. Print turns that layout into a PDF, with the pages placed on sheets in the order your printer needs. That reordering is called imposition.
Print it on both sides and you have a test copy. Read it, and if the order is wrong, drag the pages into a new order and print again.







The book laid out, and the first sheet of its imposition32 pages











