hi,
sorry for the short and unclear reply earlier,
i had faced same problem few months back, what i did was
i had the same attachment control both inside two section
in one section i went to properties of the attachment control i unchecked the checkbox (Allow the user to browse, delete and replace files.
i used to show the control based on if the file needs to be only viewed or edited.
NOTE: i used only one attachment control and two sections.