Hi, It's not an issue with with library , but a general query . We have enabled Bucket Key to save on cost for making KMS API calls , which would help in reducing the cost. Does this library supports in checking the AWS S3 ObjectMetaData BucketKeyEnabled field while the Object is put into a Bucket? If not, is there an API available in ExtendedClientConfiguration class, which can be leveraged to set the value? Thanks in advance. Milind