Different devices have different issues. We do not have the technical information to assist you with your devices. Please use the links provided in this article.
We suggest downloading zip files to your computer and unzipping them. You can then send the book/report to your device for reading. If you do not have access to a computer, please open a ticket for assistance.
Apple
Here's an article on what to do if you don't have enough storage:
https://www.apple.com/support/
Android
Android devices have different issues than Apple devices. Here's a site you can use to help you with your issues:
http://www.androidcentral.com/help
Note: To use the links in this article, copy/paste it into a browser address bar.