Error in 2.2 Audio Chooser

I upgraded to the SVN 2.2 version to get the new features, and when I go a campaign and click in audio chooser I get a white rectangle in my browser, and it matter not if this is Safari or Windows IE. I solved this by uploading manually my wav file to the directory and the Audio Chooser works now. The problem is, I cannot find in my campaign definition where to associate my wav file or the "external extension" for my agent, as it was in the previous version. So how do I
a) upload my wave file from the web interface
b) how do I make the campaign play my file?
a) upload my wave file from the web interface
b) how do I make the campaign play my file?