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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