Where to save GoogleService-Info.plist in Flutter without Xcode?
Somewhere along the line, AppUploader must be using XCode to build an iOS app from your code. While I don’t know how they do that (their documentation is scarce on details), the best you can hope for is to put the google-services-info.plist in the right place before uploading the app.
In my projects I always put the google-services-info.plist in the myappname/ios/Runner directory that the Flutter tooling auto-generates. That’s where the build then picks it up from.
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