iBook is NOT ePub. It’s an extension of the format. Drag and drop will not produce a book readable of apple devices immediately.
You need to extract the book package and then recompress it in the correct order.
There is an app I found that will do this one book at a time. I’ll edit and add the app shortly. Which works for doing a few books by hand.
I’m here looking to see if someone came up with a faster method.
I’ve managed to script the process for folder batching using nZip but it’s inconsistent. It misses files and doesn’t always stick to the item order for adding to the new zip file. Meaning it could take a few tries and requires manually opening each book to test. A problem when switching between platforms.
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