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• check if your client using mobile or not:

function isMobile() {
  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
    window.navigator.userAgent
  );
}

• dowonloading a file without user approval **:

function downloadFile(url, name) {
  const elink = document.createElement("a");
  elink.style.display = "none";
  elink.href = url;
  elink.download = name;
  document.body.appendChild(elink);
  elink.click();
  document.body.removeChild(elink);
}