title: App size doubles after using Play Asset delivery in Unity
body: <p>i just exported my game to use Play Asset delivery following this guide:
  <a href="https://docs.unity3d.com/2021.1/Documentation/Manual/play-asset-delivery.html" rel="nofollow noreferrer">https://docs.unity3d.com/2021.1/Documentation/Manual/play-asset-delivery.html</a></p>
  <p>in short</p>
  <ul>
  <li>build app bundle enabled</li>
  <li>split application binary also checked.</li>
  </ul>
  <p>The exported aab size is 311mb and when uploading to google play it says:</p>
  <pre><code>base               ----install_time  ---30.1mb
  UnityDataAssetPack ----install  time ---264mb
  
  </code></pre>
  <p><a href="https://i.stack.imgur.com/6iw91.png" rel="nofollow noreferrer" title="sorry, the screenshot is in spanish"><img src="https://i.stack.imgur.com/6iw91.png" alt="enter image description here" title="sorry, the screenshot is in spanish" /></a></p>
  <p>But then when i download the app in any device, the file size is 846mb, more than double the expected size. Also it tries to download all at once, i thought that the dataassetpack was downloaded after the base one.</p>
  <p>i'm using Unity 2021.1.16f1</p>
  <p>Do you know any cause for this to happen, and how to fix it?
  thank you very much!</p>