If you update something that affects the way your book is printed, you may need to submit a new cover file. For example, if you change from Standard Color 50 to Premium Color, the weight and thickness of the paper is different, and the book’s spine width will change. A new cover file with the correct spine width will need to be submitted to accommodate your changes and ensure the best printing results.
You should be prompted during the metadata change to submit a new file if necessary.
*Please note any updates that affect the printing of your book will also affect the printing cost of your book.