StorageManager Generic Endpoint Doesn't Work

storagemanager endpoint doesn't work as shown in the file notes:

# Specify the endpoint to connect to if using an S3 compatible object

# store like Google Cloud Storage or IBM's Cleversafe.

# endpoint = s3.amazonaws.com 

Only works if the full endpoint is specified in storagemanager such as endpoint = s3.us-east-1.amazonaws.com
No errors are thrown, it will fail silently with s3.amazonaws.com as written and shown as the example.