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"You can upgrade your Photo Book type from one to another of the same size. The option to do that is on the ‘Review page’ in the book builder.  Keep in mind, you can only go up in book type quality. For example, you can upgrade a Softcover book to a Hardcover book, but cannot upgrade a Hardcover book to a Softcover book, or change the book size. If you choose to upgrade your photo book two versions of the book will be saved, the original book format you chose, and your upgrade book."
<https://www.snapfish.co.uk/photo-books?cid_co=uk&cid_so=sfuk&cid_ch=soc&cid_su=blg&cid_me=post&cid_ca=RoyalBaby2&cid_pr=ste>