Correcting a typo may be a straightforward file update, while changing chapters, title or content can affect reader expectations and edition identity. Keep a change log that records what was revised, when and in which formats. Review each platform’s update policy before uploading.
If changes are substantial, discuss whether a new edition, revised publication date or new ISBN is appropriate. Notify readers when the update affects what they will find inside. Clear version management helps maintain trust and prevents old files from circulating unnoticed.