A Note About Packages
Leanpub has a "Packages" feature that lets you add digital content for sale along with your book, creating a "Package" of the book and the additional content that people can buy.
You can learn how to create Packages here:
The Default "The Book" Package
The way Leanpub works, when you create a book, it is technically a "Package", but a special one that only includes your book.
The name for this Package is "The Book", and you'll see it if you go to your Packages page:
You can actually add Extras to this package!
If you do that, we recommend that you rename the package to be something like "The Book + The Audiobook", naming the type of extra content you have added to the package.
What Readers Will See
After someone buys your book, they will get a download link for the "Extras" in their purchase email, on the post-purchase page, and they'll also see the "Download Extras" link when they select the book in their Leanpub library:
What Happens To People Who Already Bought My Book If I Add Extra Content To It Later?
If you add Extra content to a book that people have already bought, currently, your existing readers will not get a notification about it.
However, they will be able to see the "Download Extras" link if they select the book in their Leanpub library.
In this case, we recommend that you update your "About" information to make it clear that you have added extra content for sale along with the book.
You could also try publishing a new version of your book and emailing your readers about it:
https://help.leanpub.com/en/articles/4178568-i-m-publishing-an-in-progress-book-how-can-i-contact-my-readers-when-i-publish-a-new-version-of-my-book-with-a-new-chapter
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