saveToGallery static method
Implementation
static Future<String> saveToGallery(String filePath) async {
final file = File(filePath);
final directory = await getApplicationDocumentsDirectory();
final destinationPath =
'${directory.path}/snap_saved_${DateTime.now().millisecondsSinceEpoch}.png';
await file.copy(destinationPath);
return destinationPath;
}