An EPUB with Media Overlays already carries its narration, yet the Chapters tab required audio files and the Editions panel offered to request an audiobook the book already had.
List the narration sections of such an EPUB as a read-only chapter list, and count the narration as the audio half when deciding which format is missing. The chapters state gains an optional readAlong flag, so released clients keep working. Editing stays tied to audio files, because an EPUB has no chapter metadata to write.
Ref #2032
Add a Chapters tab to edit chapter timing and titles, look chapters up on Audible or in the ebook,
snap starts to pauses, keep a version history and write chapters into M4B, M4A and MP3 files. Add a
chapter health tool with a bulk Audible lookup queue. Editing needs Editor access to the book's
library. Chapter edits keep released iOS playback working by accepting a stale manifest revision
while the track layout is unchanged.
Ref #1120
neon