public final TransferManagerBuilder withMultipartCopyThreshold(Long multipartCopyThreshold) {
        setMultipartCopyThreshold(multipartCopyThreshold);
        return this;
    }
Sets the size threshold, in bytes, for when to use multi-part copy. Copy requests for objects
over this size will automatically use a multi-part copy strategy, while copy requests for
objects smaller than this threshold will use a single connection to copy the whole object.

@param multipartCopyThreshold Threshold in which multipart copies will be performed.
@return This object for method chaining.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/transfer/TransferManagerBuilder.java