Firebase Storage flutter uploadTask.onComplete crashes ios app - ios

Question

i have flutter app setup with firestore, fcm and firebase cloud storge which works great on android, and on ios i have added GoogleService-Info.plist to Runner from xcode and also called await Firebase.initializeApp(); on my main.dart on android firestore and storage works good i am able to CRUD data, upload files but when i try to upload media on to firebase on
ios with this code
Future uploadFile(int index, int type) async {
String fileName =
DateTime.now().millisecondsSinceEpoch.toString() + "${widget.userId}";
StorageReference reference = FirebaseStorage.instance.ref().child(fileName);
StorageUploadTask uploadTask = reference.putFile(File(images[index]));
StorageTaskSnapshot storageTaskSnapshot = await uploadTask.onComplete;
storageTaskSnapshot.ref.getDownloadURL().then((downloadUrl) {
setState(() {
isLoading = false;
imageUrl = downloadUrl;
});
}, onError: (err) {
setState(() {
isLoading = false;
});
});
}
the ios app crashes abnormally nothing is being printed on the console when run normally
but when run on verbose mode i see this logged
[+123976 ms] Service protocol connection closed.
[ +1 ms] Lost connection to device.
[ +35 ms] DevFS: Deleting filesystem on the device
(file:///Users/Me/Library/Developer/CoreSimulator/Devices/12E19722-CC83-452B-B263-EF624D069BED/dat
a/Containers/Data/Application/BC48EA57-B913-4281-9628-59C783B0FE77/tmp/r2a_mobile28vRsI/r2a_mobile/)
[ +258 ms] Ignored error while cleaning up DevFS: TimeoutException after 0:00:00.250000: Future not
completed
[ +4 ms] "flutter run" took 223,298ms.
[ +271 ms] ensureAnalyticsSent: 264ms
[ +2 ms] Running shutdown hooks
[ ] Shutdown hook priority 4
[ +7 ms] Shutdown hooks complete
[ +2 ms] exiting with code 0
have also added <key>CFBundleURLSchemes</key> on to my info.plist with my REVERSED_CLIENT_ID from google plist
Firebase Packages on pubspec:
firebase_core: ^0.5.0
cloud_firestore: ^0.14.0+2
firebase_storage: ^4.0.0
firebase_messaging: ^7.0.0
Flutter Version:
Flutter 1.20.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision bbfbf1770c (10 days ago) • 2020-08-13 08:33:09 -0700
Engine • revision 9d5b21729f
Tools • Dart 2.9.1
i really need some help here
Thanks in Advance