paper background image does not appear in exported png/svg/jpeg file

paper.toPNG(function (dataURI) {
      const link = document.createElement("a");
      link.href = dataURI;
      link.setAttribute("download", 'fileName.png');
      document.body.appendChild(link);
      link.click();
    });

The above code is use to export in PNG format, but the paper background image is not applied to the downloaded image

The background image is applied as flows

paper.drawBackground({
        image: 'image url',
        position: 'center',
        repeat: 'no-repeat',
        size: 'cover',
        opacity: 1
      });