def preprocess(self, payload: FileData | None) -> str | None:
        """
        Parameters:
            payload: A FileData object containing the image data.
        Returns:
            A `str` containing the path to the image.
        """
        if payload is None:
            return None
        return payload.path

        Parameters:
            payload: A FileData object containing the image data.
        Returns:
            A `str` containing the path to the image.
        
gradio/_simple_templates/simpleimage.py