A client asked the feature of permalink to PDF / document as he need to display URL of PDF / document on their social media such as facebook. But they update the pdf fairly regularly, so he would prefer to not have to reset the giant url directly to the pdf every time they update the pdf.
As this feature is interesting and many users may use it so we decided to add it. Every PDF / document has a unique ID in our plugin database so it is easy to add this feature. From version 2.8 you may visit a PDF / document directly by the URL of :
The 100 is a valid PDF / document id.
With this feature you may update / change your PDFs / documents anytime and visitors can always reach to it by the permalink to PDF / document.