for each upload file server behavior, there is a new binding group on the bindings panel named:
WA UPloaded Files(<Name of file Field>)
where <Name of file Field> is the name of the Name of file Field for that upload. In that binding group is a binding named Server File Name.
the in the Update Record behavior, you have bond the File columns to the File Field from the form collection. Instead, you should be using the Server File Name binding from the corresponding WA UPloaded Files(<Name of file Field>) binding group.