i am having the most difficult time with this, I absolutely need this functionality for college, I like all of them in one central place so I can read my assignments on the go. I also need to be cross device compatible and to be able to access this stuff without an internet connection, I am often away from one and most in my area are locked or extremely slow and insecure. I have tried iBooks totally useless, it only accepts documents on my iPhone, which is running iOS 10, been scared to update, they do not sync to anything else. Does iBooks only work on one device? I also use a kindle fire so I need to be able to read these things on both an iPad or kindle. I have tried sending docs to kindle that does not work either. I am on an iPad Pro with iOS 11. Can anyone please help me, have I made a mistake with the iPad? Can it accept various document types?