3D FlipBook - Hi there, I have downloaded the flip book and I really like it…. however I am having some issues with the URL of where the

Hi there,

I have downloaded the flip book and I really like it…. however I am having some issues with the URL of where the flip book is saved. I would like to simply have a thumbnail image (standard wordpress gallery image) and then when you click it, it then opens the PDF using flipbook. I am using the URL but it is saying it doesnt exist. What am I doing wrong? Thanks