title: Sharing bundled assets between app and extension
body: <p>My Photo Sharing extension plans to use the same design assets (for navigation and for adding 'stamps / stickers' to the photo). </p>
  
  <blockquote>
    <p>As explained in App Sandbox Design Guide, groups of sandboxed apps
    that need to share files and other information can request a container
    directory as part of their entitlements. These directories are stored
    in ~/Library/Group Containers/. <a href="https://developer.apple.com/documentation/foundation/nsfilemanager/1412643-containerurlforsecurityapplicati" rel="noreferrer">https://developer.apple.com/documentation/foundation/nsfilemanager/1412643-containerurlforsecurityapplicati</a></p>
  </blockquote>
  
  <p>Currently the assets are bundled in or downloaded and added to the <code>Documents</code> folder. If I want to use the assets in the Photo Sharing extension, would it make sense to put everything in the <code>~/Library/Group Containers/</code> and both the container app and the extension get the assets from there?</p>