The Photo Gallery templates accessible from within the Photo Galleries folder in the design gallery contain a set number of images. You can replace these images with your own and the easiest method to do this is to simply drag and drop multiple images from windows explorer into your document. If you drag and drop more images than available within the template, then the program will provide the following options.
1. Duplicate page - This option will duplicate the current page and replace the default images with the additional images you have dropped into the document.
2. Add new photos - This option will add the additional images into the document but not replace the original images used within the photo gallery.