I have been trying to figure out how to upload the books I download from the Google Play store into dropbox, or even simply Google Drive. I have also downloaded ES File Explorer; however, every time I go to upload a book into either drop box or Google drive, it doesn't show me the option to select the book I've purchased. It has an ebooks file but my download isn't in it. Also, the Kindle app is also an option, but my book isn't a kindle file. I'd really like to back up these purchased books for different reasons. Am I completely missing something?? I've googled this and all of the answers are for uploading kindle files onto the device, you all seem tech savvy, what do I need to do? Thanks for your help.