问腾讯云 cos 上传文件 后 0kb？

const COSSDK = require('cos-nodejs-sdk-v5'); // 该模块已经更新到最新
const r = await Txyun.uploadFile({
          Bucket: opts.Bucket || incfg.Bucket,
          Region: opts.Region || incfg.Region,
          Key: fileName,
          FilePath: `${filePath}${fileName}`
});

// Txyun.uploadFile 就是该方法
static async uploadFile(params) {
    console.log('uploadFile params:', params);

    return new Promise((resolve, reject) => {
      cos.sliceUploadFile(params, (err, data) => {
        console.log('uploadFile err:', err);
        console.log('uploadFile data:', data);

        // 上传成功后删除本地文件
        // fs.unlinkSync(params.FilePath);
        if (err) {
          reject({ status: 202, error: err });
        } else {
          resolve({ status: 200, data });
        }
      });
    });
}

// 数据正常返回了，但是上传后的文件是0kb
{ Location: 'resource-1252108727.cos.ap-guangzhou.myqcloud.com/gxkt/test/1543221647710.mp3',
  ETag: '"d41d8cd98f00b204e9800998ecf8427e"',
  statusCode: 200,
  headers: 
   { 'content-length': '0',
     connection: 'close',
     date: 'Mon, 26 Nov 2018 08:40:47 GMT',
     etag: '"d41d8cd98f00b204e9800998ecf8427e"',
     server: 'tencent-cos',
     'x-cos-request-id': 'NWJmYmIxOGZfOTcxYzBiMDlfNWQ1Zl8xMWI2YTg=' } }