yes i want a new one which is in the header of the form and says "Download Content" so an administrator of the app just upload files and the other people enter and see the big green button saying "Download". I want it that way because thats how they said they wanted it :/

Try this
def download_document_attached(self):
self.ensure_one()
return {
'type': 'ir.actions.act_url',
'url': '/web/content/document.page/%s/document_attached' % self.id
}