A quick read of all of the supporting documentation for the iBooks Author program show that there are some limitations to the program. Apple shows the limit at 2GB and actually recommends only 1GB in order to make it easily accessible to the users. While this is not all that unusual for Apple to recommend smaller sizes, a quick check of the current offerings in the Textbook section shows that the Person Biology textbook is over 2.7gb. ALso, E.O Wilson’s Life on Earth book is at 1 gb with just two chapters of the book completed.
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