Allowing attach from Google Drive pop-up on Fluid app pointing at Asana

I have setup a Fluid App for Asana, and I have whitelisted the various URLs required for logging in. However, I am unable to attach things using Google Drive because it requires viewing a pop-up. I have checked the URL for this pop-up and whitelisted it, but it is still not displayed in Fluid. Do you know how to make it so that I can attach things from Google Drive using Fluid?