There are a few bugs in this app that need to be resolved. The PDF app hasn't had an update in over two years(?)!!! Since March of 2013?
If you are on the iPhone you can't add more than one photo at a time. If you click to add another photo, the screen turns black and you have to exit all the way out of the app.
Sometimes after returning from a link to a YouTube video, there is a black bar across the top of the page that offsets the threads. This can be remedied by turning the phone to landscape and back. A minor glitch and easy to fix, but a glitch none the less.
Also, most recently there has been a problem with quotes not showing properly. Check