How To Access Google Storage

I'm trying to access Google Cloud Storage, an S3 compatible service, using as the host, & My secret access strings as my username/password, but I get 403 forbidden errors.
How do I access my Google Storage account in SmartFTP?
Please advise.

This is currently not supported. "S3 compatible" means that it is similar to Amazon's S3 but it doesn't work out of the box without significant changes.