I just wanted to chime in that this thread was great. The end code worked perfectly. I also use Cirrus Files and wanted to add it to my Skuid pages. My only regret was that it took me an hour of searching to find this thread. You should think about building some basic tutorials for this kind of thing and for managing custom buttons. Most of us use third party applications (like Cirrus Files, DocuSign and LOOP) in our Salesforce instances, but your documentation has very little on how to add the buttons and VF pages that those third party apps incorporate.
