How you add an image to a Leanpub book depends on your writing mode!

If you're writing in our In-Browser Text Editor, here are the instructions:

http://help.leanpub.com/en/articles/4133358-how-do-i-add-an-image-or-picture-to-a-book-if-i-m-using-the-in-browser-text-editor

If you're writing in the GitHub or Dropbox writing mode, here are the instructions:

http://help.leanpub.com/en/articles/5022467-how-do-i-add-an-image-to-a-leanpub-book-if-i-m-writing-in-the-github-or-dropbox-writing-mode

Finally, if you'd like to insert an inline image, here are the instructions:

http://help.leanpub.com/en/articles/3919168-how-do-i-insert-an-inline-image-in-markua