[aws_s3_api] What should I do to get the upload progress

[xiyionxiong]

var stream = s3
          .putObject(
            bucket: sts.bucketName,
            key: pathKey,
            body: file.readAsBytesSync(),
          )
          .asStream();

      stream.listen((event) {
        logger.d(event);
      }).onDone(() {
        logger.d('upload finished');
      });
    } catch (e) {
      logger.e('upload error: $e');
    }

when i listen as stream ,it will return PutObjectOutput after all uploaded.