The lastest version of Sync iOS (2.4.8) is not be able to add folder by key.
It gives me "This link or key is invalid. Please check the source and try again."
The key is BRSSYZTSAC6UGYTUOJ22L4GCO7QESPPBD and I'm sure there is no error during the copy/paste process
seems like someone also is encountering the same problem
Thank you.