title: Added icons in manifest.json but got no icon in splash screen
body: <p>My demo is not finished yet but you can find it here:
  <a href="https://frp.im/dev/timedrops/target/" rel="nofollow">https://frp.im/dev/timedrops/target/</a></p>
  
  <pre><code>{
    "short_name": "Timedrops",
    "name": "Timedrops",
    "icons": [
      {
        "src": "drop-128x128.png",
        "sizes": "128x128"
      },
      {
        "src": "drop-96x96.png",
        "sizes": "96x96"
      }
    ],
    "start_url": "index.html",
    "display": "standalone",
    "orientation": "portrait",
    "background_color": "#3E4EB8",
    "background_color": "#3E4EB8"
  
  }
  </code></pre>
  
  <p>I followed the steps of creating progressive web apps and tried to add a splash screen first, but failed to display my icon. I also checked HTTPS, still not working in HTTPS. I went though some examples and my JSON is almost right. Why I can't see my icons?</p>