I manually opened a Filemaker-created PDF in Adobe Acrobat Reader and Saved it. Now it is not "greyed out" anymore and I can select and view it in the interactive field! Not sure why this worked. It must be changing some setting to the file. Can anyone help me figure out how to script this? (We can't have users manually opening every file.)
I solved my problem. My file name needed ".PDF" at the end.