I need help, lots of help. Someone sent me a drop box link containing a pdf image that I need. I logged in, created my account, even downloaded the app. However, when I click the link provided to me for said image, I get "Error (403) It seems you don't belong here! You should probably sign in. check out our Help center and forums for help, or head back to home." That's fine, except I saw nothing that explains to me how to get my much needed file to open. This is a very important pdf image as it is my book cover from my designer. Is there ANYONE who can explain to me how to open this link and access the image?