We suffer with this issue too - our platform is a Lenovo Tab 3 8" (YT3-850F) running 6.0.1/Marshmallow.
This problem has been asked here at:-
This is a big problem for millions and yet it does have a solution. Would somebody from Adobe care to comment? Can we expect to have release of Reader for Android that caters for external storage?
Other apps - including Xodo PDF reader - are happy to work with external storage once the permissions are established.
NB: Xodo is a capable reader although it is considerably more resource intensive. It can be obtained here at:-
I have the same problem. Tha's why i am here.
I have a samsung phone and i can't edit a book that has been storaged in the sdcard. I want to mark or leave a comment in a book and i cant. The app wants me to create a copy in the internal storage but i moved the file to the sdcard for a reason dont they think.
I say this beacause i want a solution for this. We all want a solution for this.
Sorry if my english is bad. English isnt my first language.
We have considered the thread linked to in the last post and made a reply there. In short, this issue has not been dealt with and needs to be resolved still.