How do i insert bulk files(pdf) like images in pages in wordpress at one shot?

I’ve been able to add images as gallery with the add media option. But when it comes to documents such as pdf I can upload it as bulk, but I cannot insert those files as bulk with links. I have to choose each document from uploaded gallery and insert each document on by one.. Please help me with this issue…
This is my site, i’ve been working on for a while http://www.booktine.com