Major Description
Currently, we retrieve the list of supported regions from the AWS SDK, however, the list can sometimes be incomplete, and in some cases, new regions are added while the SDK is not updated yet.
The SDK allows for creating a "custom" region and sending the request to it. Maybe we should add another UI field for the customer to type the region instead of selecting it for convenience.
Currently, the work around is to use the service endpoint, which requires providing the full URI, and the URI will include the region in it.