Is the Multipart Copy working? I'm getting the following response when I try to copy a 6 GB file from a bucket to another:

ERROR: ErrorInvalidArgument
Message: The specified header is not valid in this context
Extra Details:
ArgumentName: x-amz-metadata-directive
ArgumentValue: REPLACE
RequestId: B9A7B3C41FB12F55
HostId: oTuaiCPM5pCw99BQ1RDzSMjSTRUXhCGKgkYvwa6KrhmGp8yM8l70+9UwvXXbH2RN9cilgPyHPRE=