I have the Moto X Pure Edition - it came with Marshmallow 6.0
Google, in its wisdom decided that the external SD card was either to be used for media (music, movies, books??) and nothing else. The other option was to format the card for extra storage for apps that could put extra data there. No mixing allowed.
If you can't do books and your card is media - then books belong in the data category. You will just have to find a reader to cope.
BTW - you can write to the regular internal memory and transfer to Ext. card via a good file manager. I'm using solid and it does split screen in landscape.
This has been a major complaint in all forums. The 6.0.1 update coming out now is doing the same. It will probably get corrected later than sooner.
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