Accessing S3 storage with WinSCP or Cyberduck

Due to customer restrictions S3 Browser is not available in our environment. I am currently trying to use WinSCP or Cyberduck, (as those clients are available) to connect to S3 buckets on our new PowerScale deployment.

Has anyone had any success using these clients? I am able to make S3 Browser connect in test environment cluster but I cannot get WinSCP or Cyberduck to connect to the same bucket/cluster.

Does anyone have incite? I'm in  the testing phase before presenting the cluster as ready for production to the customer and S3 is a highly-desired feature. The only tools I have to test the S3 functionality are WinSCP or Cyberduck.