title: Why does my Flutter app crash at startup on iOS?
body: <p>I'm trying to build a simple app using Flutter for iOS and Android, but the app crashes on startup when I try to run it on an iPhone (Android runs fine).  I don't have a mac, so I'm using Codemagic to compile a release build and deploy to TestFlight, then installing on an iPhone from there.  Apple only shows their crash logs in Xcode as far as I can tell (nothing in App Store Connect online?), and since I don't have a mac, I can't see those.  Any thoughts as to what I might be running into, or what information I can gather to debug the problem?</p>
  
  <p>Thanks!</p>
  
  <p>Edit:  I've been digging around some more and it looks like the crash is related to the Firebase dependencies.  If I create the Flutter demo project (flutter create ), it runs fine on iOS.  However if I then add Firebase packages to pubspec.yaml, and manually add GoogleServices-info.plist, the app crashes on startup. (I'm not adding any code that uses Firebase yet.) GoogleServices-info.plist is supposed to be added with Xcode, but since I don't have Xcode or a mac, that makes it tough.  The second answer to this question gives a suggestion: <a href="https://stackoverflow.com/questions/56407299/where-to-save-googleservice-info-plist-in-flutter-without-xcode">Where to save GoogleService-Info.plist in Flutter without Xcode?</a> 
  I tried making those changes but got the same result. Anybody have any recommendations for adding Firebase without a mac?</p>