[Zope] ref another file while adding file in ZMI

Rather than have to upload a file while adding a file object using ZMI, how can I refer to another existing file in the object tree? I tried putting "/root/refs/quotes/file1" in the File box but the file that was added had a mime type of application/octet-stream and worked ok once I set the mime type to text/html. Why didn't it pick up on the fact that file1 is text/html itself? I could copy the file but am trying to learn... -Patrick Price