[web2py] copying upload type field from one table to another

[niknok]

When I try to copy an upload field, the link to the file gets broken in
the new table.  What's the correct way of copying this field type?

For example, I do it like this:

    db.new_table.photo[1] = db.old_table[9]


but in new_table, I get a broken link to the file in the upload folder.

/r
Nik