SOLVED!
I found the way to do this by using the delete file field, and setting the trigger to "upload filename_here successful" then providing the appropriate key bindings.
All is good!
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.