How to Add M4B Audiobooks to Apple Books on Mac (And Why It Sometimes Doesn't)

Drag an M4B into Apple Books and it just works — unless it doesn't. Here's why, and how to fix it.

How to Add M4B Audiobooks to iPhone (Why It's Hard)

AirDrop won't do it. Files app won't help. Here's the one method that actually gets M4B audiobooks into Apple Books on iPhone.

How to Convert MP3 to M4B on Mac (Chapters That Work)

How to convert MP3 to M4B on Mac — with real chapters, metadata, and proper resume in Apple Books.