Thank You for you answer Sir,
Here are the answers at your questions, but before I wanted to say that CC is the only app in my phone to show this path (/mnt/media_rw/4D96-1407/) for my SD card. Rocket Player, X-plore, Acrobat Reader have "/storage/4D96-1407/" and I can open a book with MoonReader or Acrobat from within X-plore without trouble.
Answers:
I'm using the last version of CC: 5.1.0.3 (320)
My version of Android is Marsmallow ROM, 6.0.1 (
http://forum.xda-developers.com/moto...f-6-0-t3284309)
with this Kernel:
http://forum.xda-developers.com/moto...4-108-t3169304
With a MM ROM, I wanted to say a Marshmallow ROM...sorry.
Q:"Are you opening the book from inside CC or with Moon+?"
That's the point, when I try to open a epub in CC it open MoonReader but but it don't open the book. If I want to open the book with MoonReader I have to search for the book from within MoonReader and open it. As I'm using the Calibre ID as the file name (for reading positon syncronisation reason) if I import the books in MoonReader I will find it because MoonReader read the tags, but in Acrobat Reader I will have just a list of title without signification.
The filemanager i'm using (X-plore) show me the path:"/storage/4D96-1407/"
I have reinstaled the ROM with TWRP after a try to use the SD as internal storage. Before the instal I format the card as external storage to put the ROM, Gapps, etc on it and reboot to TWRP. I formated the data, erase everything but SD and instal the ROM.
I tried 2 things with CC: Instal it from the Playstore and configure it from zero, and reinstal a Titanium backup from a Lolipop ROM, both with the same result.
When I want to change the folder in the CC settings, it's posible but with its strange path. I can tell CC to use the folder I want, it's just that for CC this folder's name is: /mnt/media_rw/4D96-1407/Books and for the others apps it's: /storage/4D96-1407/Books. CC can write the book on the folder, connect with the PC and everything but it will not send a book to a reader app.
I thank you very much for your time and your app. If I need a reader like MoonReader, I just love CC and I'm ready to reinstal everything to make it work.
I send you the CC debug log, it has only one book for test purpose.