downloadMedia method

Implementation

Future<void> downloadMedia() async {
  state = state.copyWith(isDownloading: true);
  //Download media if media path is not available
  final tempDir = await getTemporaryDirectory();
  final mediaPath =
      (await attachment.downloadMedia(null, tempDir.path)).text();
  if (mediaPath != null) {
    state = state.copyWith(mediaFile: File(mediaPath), isDownloading: false);
  }
}