Editions and ISBNs
One manuscript, every edition: ebook, paperback, hardcover and large print, each built from the same text, each with its own ISBN.
Each edition is a build configuration with a name and, if you like, its own ISBN. The edition’s ISBN identifies its ebook, and on the copyright page Septangular fills in this edition’s name and ISBN, and every edition’s ISBNs, one to a line (“ISBN 978-… (Paperback)”). Correct a typo once, and every edition has the correction the next time you build it.
To keep track of what went out, mark each edition as published when you upload it.
Editions are part of Septangular Publish.