public void upload() {
            this.lastRangeReadCf.whenComplete((nil, ex) -> {
                if (ex != null) {
                    partCf.completeExceptionally(ex);
                } else {
                    upload0();
                }
            });
        }
The minPartSize represents the minimum size of a part for a multipart object.
s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java