I created a field and added this string S:\PLANS\AAPLANS\PLATS\PB 36\PB 36 65 TEST U-7.pdf
Then I went to the Display tab in the layer properties, checked "Support Hyperlinks using field:" pointed to the field I put in what is seen above and checked document.
Now when I use the little lightning bolt icon I can click on an address and it opens the pdf.
Is this how you did it?