Will I receive any communication with the External Transfer service in RCU Online banking?

Can I add comments to External Transfers I have set up in RCU Online banking? Can I use the External Transfers service to transfer money between RCU accounts in the RCU Online banking? What happens if an External Transfer in RCU Online banking transaction is returned unpaid to RCU? What if I am unable to verify the trial deposits required for External Transfers validation in the RCU Online? How long do electronic transfers take to process in RCU Online banking?