[Zope] manage_addFile won't work

The following python code works when I upload a local file to my local Zope server, but gives a "resource not found" error when uploading any local file to a Zope Server across the internet: context.manage_addFile(id, file=new_file_object, title=title, precondition="", content_type="") (If I change "file=new_file_object" to "new_file_object" there is the same problem) Does this mean that I have to process the path/filename in a different way, or is it some kind of permissions issue ? And how can I simply overcome the problem, do I need to use an external method or some other solution? Mark Spencer.