def METHOD_NAME(self, file_content: str = "S3cr3t f1l3") -> None:
    # Write the content to a file
    with tempfile.NamedTemporaryFile() as file:
        file.write(file_content.encode("utf-8"))
        file.seek(0)
        filename = file.name
        # Submit the file
        self.nav_helper.safe_send_keys_by_id("fh", filename)
        self.nav_helper.safe_click_by_css_selector(".form-controls button")
        def file_submitted() -> None:
            if not self.accept_languages:
                notification = self.driver.find_element_by_css_selector(".success")
                expected_notification = "Thank you for sending this information to us"
                assert expected_notification in notification.text
        # Allow extra time for file uploads
        self.nav_helper.wait_for(file_submitted, timeout=15)
        # allow time for reply key to be generated
        time.sleep(3)