private void init() {
        FutureUtil.propagate(
            operator.createMultipartUpload(writeOptions, path).thenApply(uploadId -> {
                this.uploadId = uploadId;
                return uploadId;
            }),
            uploadIdCf
        );
    }
The minPartSize represents the minimum size of a part for a multipart object.
s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java