Okay, tested and found wanting.
It looks like that first rake command only works for AWS.
rake aborted!
Seahorse::Client::NetworkingError: Failed to open TCP connection to exotics-unlimited.s3.auto.amazonaws.com:443 (getaddrinfo: Name or service not known) (Seahorse::Client::NetworkingError)
Is there another command that does the same thing with other S3 vendors?