When writing a book you’ll see a new icon in the upper left of the edit page dialog. Clicking this icon will make a copy of the page you’re currently editing. This can help when you need to say more on a page than will fit in the caption area. Simply duplicate the page and continue your thought.
The maximum image upload has been increased to 10 megabytes.
And I have fixed a bug that caused editing a draft book to fail if you rearranged the pages.