title: Expo on iOS is constantly refreshing my React Native app on MacOS, caused by Dropbox / iCloud
body: <p>I'm building a simple React Native app and using the Expo iOS app to run it. But Expo is constantly refreshing my app, making it unusable / untestable. It refreshes every few seconds, sometimes multiple times a second, when I haven't changed anything. The only times when there is enough of a break between refreshes for me to test out the app is when, in my terminal, the app decides to rebuild (Again, nothing changed) and takes a few seconds to rebuild the bundle.</p>
  
  <p>I set up the app using <code>create-react-native-app</code> and run it with <code>npm start</code> -- I've changed nothing else, besides adding a few components.</p>
  
  <p>I've tried quitting my IDE (Sublime) and changing to a stronger wifi network.</p>
  
  <p>I'm developing on macOS Sierra 10.12.2 and running on an iPhone 6S.</p>