title: App Thinning Size Report reports totally different size then App Store size
body: <p>I have a big iPad app that has an iPhone &amp; Watch "remote" app, ie. a little app that runs on the iPhone/Watch to remote-control the ipad. All of this is together in a universal app. For app thinning I've separated assets in the assets catalog as required. <strong>The app is already on the App Store (released).</strong>  The app has a minimum SDK version of iOS 8.1.</p>
  
  <p>When I take the Archive that was released on the App Store, do an adhoc export, choose to build from bitcode, and choose to export for iPhone 6S, then the <code>App Thinning Size Report.txt</code> shows "19MB compressed, 39.4MB uncompressed". 19MB would be acceptable to me, considering there's 2 * swift dylibs in there (watch appex, and main app)</p>
  
  <p><strong>BUT</strong>: On the app-store when viewed on an iPhone 6S with iOS 9.3.4, the app size shows as a massive 42MB download! I assume this is compressed, so why is this more than twice as big as the 19MB that I was expecting? Is it because the app supports iOS 8.1, and therefore no app thinning ever happens even for devices that have iOS 9?  </p>
  
  <p>I want to release an update to fix this but I don't know where to begin.</p>