prepareMessage method
Will be called
Implementation
@override
Future<ByteData?> prepareMessage(BuildContext? context) {
  return _resolveBundle(context).load(
    packageName == null ? assetName : 'packages/$packageName/$assetName',
  );
}Will be called
@override
Future<ByteData?> prepareMessage(BuildContext? context) {
  return _resolveBundle(context).load(
    packageName == null ? assetName : 'packages/$packageName/$assetName',
  );
}