Support for AES-GCM as per AWS spec: https://docs.aws.amazon.com/general/latest/gr/aws_sdk_cryptography.html#crypto_features has been added mid 2022.

We're considering further upgrades to the encryption scheme, e.g.: https://syncaware.canny.io/feature-requests/p/support-for-xchacha20-poly1305 to provide best level of security, performance and features.