You can choose to generate a preview of only a subset of your book, if you are in Dropbox, GitHub, or Bitbucket writing mode.

This only produces a PDF, because the whole point is to generate the book faster than usual.

To do this, create a file called Subset.txt  in your book's manuscript folder.

Then, go to the preview page for your book in Leanpub, and select "SUBSET PREVIEW".

Then, click the blue "Create Preview" button.

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