Flutter - uploading mp4 to Firebase storage - only audio captured

I am able to successfully upload a .mp4 file, captured with the camera package, to firebase storage but only the audio exists when playing the video from firebase storage.

The actual video is blank.

Here is a code snippet used to upload the file:

Future<String> uploadFile({required String uid, required File file}) async {
    final fileName = file.uri.pathSegments.last;

    final filePath = "$uid/$fileName";

    final uploadTask =
        FirebaseStorage.instance.ref().child(filePath).putFile(file);

    final snapshot = await uploadTask.whenComplete(() {});

    final downloadURL = await snapshot.ref.getDownloadURL();

    return downloadURL;
  }

I can see where the file is temporarily stored on the iphone:

flutter: /var/mobile/Containers/Data/Application/F6913B6A-7282-41D0-AF6A-00DD5EDCEDC3/Documents/camera/videos/REC_43F873D2-A6AB-4BC3-ADDD-3B3EB71B56B7.mp4

And, I can also preview the video in the app that I am creating before uploading it.

But, once uploaded and I go to firebase storage to view it, I am only able to hear the sound, not see the actual video.

Thanks in advance