I did a search and did not find what I was looking for...

I have a report that I want to allow the user to click a field and that will take open a pdf file located on our server. I did a right click, format field, when to the hyperlink tab, selected "a file" under the Hyperlink information, I entere the server name and path (
\\vn-...\d...\g...\ ) and in the formula field, I referenced the pdf file name ({vGateLog.InRefNum}).
That doesn't work as I get a message that says, "Unable to open the hyperlink:" {file name provided in formula}
What am I doing wrong?
Thanks!! 