I had always thought about using Calibre to organize things better also, but it appears to me that it's oriented towards a 'one file per format' structure.
I had tried to add a 2 MP3 audio book and it created two separate 'books'. Adding the first MP3 and then trying to add the second into the same 'book' would replace the first MP3. I would have preferred to have all MP3s in one 'book' without zipping them.
But I'm happy since it does a great job for my ebooks in epub and azw3 (plus a few in other formats), so I don't worry about it.
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