admin.dukany.io/public/assets/js/audio_cache_sw.js

const FILE_NAME = 'https://admin.meemapp.net/notif-order.mp3';

self.addEventListener('fetch', event => {
  // Checking if the url matches the audio file.
  // This is actually not really needed right now, we could just check if the request is
  // cached (for any file) and return it. If you decide to put the response from the network
  // fetch into the cache then this check might be valueble to only store the audio files.
  if (event.request.url.indexOf(FILE_NAME) === 0) {
    console.log('Audio file requested!')

    event.respondWith(
      caches.match(event.request).then(function(response) {
        console.log(Boolean(response) ? 'Serving from cache' : 'Fetching from network');
        return response || fetch(event.request);
      })
    );
  } else {
    event.respondWith(fetch(event.request));
  }
});