1/Hi there;
2/ The specific problem is: my files (e-Books, classes, courses, lessons, trainings) will be exposed in your website (https://issuu.com). Consequently, anyone could access my files (e-Books, classes, courses, lessons, trainings) without a login in my website;
3/ I added a bad rating to your plugin because it did not meet my expectations;
4/ Thanks for the “quick reminder” and MAYBE YOU SHOULD WORK A LITTLE HARDER. I’m sorry for the bad rating but the plugin how it is (version 3.1), unfortunately, deserved it. Zero Star, not even one! =(