title: How do I deal with the "App Preview is too large" error in App Store Connect?
body: <p>I'm having trouble uploading <a href="https://developer.apple.com/app-store/app-previews/" rel="noreferrer">App Previews</a> in App Store Connect. Despite following all of <a href="https://help.apple.com/app-store-connect/?lang=en/#/dev4e413fcb8" rel="noreferrer">Apple's specifications</a>, App Store Connect rejects the file with messages like:</p>
  <ul>
  <li><strong>&quot;Your app preview is too large&quot;</strong> (despite it being way below the max size of 500MB)</li>
  <li><strong>&quot;The dimensions of one or more previews are wrong&quot;</strong> (despite them being correct)</li>
  </ul>
  <p>This happens either as soon as I start uploading the file or after it has finished processing.</p>
  <p>It also happens for both supported formats: H.264 and ProRes 422 (HQ). I have tried using about 10 different export presets for the file, and even tried re-converting my (already compliant) video editor output with ffmpeg, but no luck.</p>
  <p><a href="https://i.stack.imgur.com/MiNPe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MiNPe.png" alt="Example error message: The dimensions of one or more previews are wrong" /></a></p>