Amazon certainly did do something weird with the sd card. The only way to get to the external sd is by /storage/sdcard1. /storage/emulated and /mnt only get you to the internal sdcard. I don't have a lollipop device with an sdcard so I don't know if that's the way lollipop does it too.
ES file explorer can write to the external sd after it requests access. Moon+ can't wrte to the external sd - when I try to set the default folder to the external sd it returns an error. I think the inability to use books on the external sd is a problem for the Amazon app only. When I use ES to put a book on the external sd Moon+ can read it.
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