Crashing at the end – Book Writer Review

I have a iPhone 6+.. Spent time creating and editing the book. When I try to email the book - it crashes. If I try to send PDF it crashes. If I try to publish the book it crashes. If I upload to Drop Box and then try to open file from Drop Box it fails. If I try to open in another application, it crashes. The only reason I didn't give it just one star is because if they fix these issues, it would be an awesome app. The user interface is is easy to use. So frustrated.
Review by International Mel on Book Writer.