Hi Hiroko,
Sorry for the late answer! And welcome as a "poster" in this mailing list
:).
Are you saying that you'd like to have a form with an `xf:upload` field, and
when users select a file, you would like to have that file stored as a
temporary file on your server running Orbeon Forms?
If so, then the good news is that the `xf:upload` does that automatically
for you: just after users select a file, the file is sent to the server, and
in the instance the node bound to the `xf:upload` will contain the URL to
the temporary file. So there really is nothing you need to do to write that
file.
Does this make sense, or did I misunderstand your question?
‑Alex
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