I recently figured out that this plugin or the frame... supports PDF views via lightbox...so installed it and uploaded my PDF files on Image/Video URL box, but it didn't load the PDF file, instead showing the error message "Image cannot be loaded. Make sure that the path is correct and image file exists.".
I tried to figure it out and came to install another plugin that makes lightbox load PDF files called "Easy FancyBox". The result is, now the portfolio page loads PDF files well enought, but still with the error message "Image cannot be loaded. Make sure that the path is correct and image file exists."
I wonder what the problem is...
my website is http://www.sideamusic.co.kr and the portfolio page is the second one on the menu.
(The page is in Korean, so you might find it a little confusing)