I believe S3 can only do create-if-not-exist, which won't help for overwriting a pre-existing branch ref only-if-not-concurrently-updated. https://docs.aws.ama

I believe S3 can only do create-if-not-exist, which won't help for overwriting a pre-existing branch ref only-if-not-concurrently-updated. https://docs.aws.amazon.com/AmazonS3/latest/userguide/conditional-requests.html#conditional-writes https://docs.aws.amazon.com/AmazonS3/latest/userguide/condit...