HarmonyOS 鸿蒙Next 文件上传问题

HarmonyOS 鸿蒙Next 文件上传问题 API9 通过screenshot截图保存到了沙箱路径下，将这个截图文件上传到服务器提示is bad file path，这个是什么问题。下面是我的代码：

let fileName = args[0] + '.jpeg' //文件名字包含后缀
let name = args[0] //文件名称
let uri = 'file:/' + args[1] //文件沙箱路径
let uploadConfig: request.UploadConfig = {
  url: url,
  header: { key1: 'Content-Type', key2: 'multipart/form-data' },
  method: http.RequestMethod.POST,
  files: [
    { filename: fileName,
      name: name,
      uri: uri,
      type: 'jpeg'
    }
  ],
  data: [
    { name: 'name', value: name }
  ]
}

try {
  request.uploadFile(context, uploadConfig)
    .then(uploadTask => {
      uploadTask.on('complete', () => {
        this.httpCallBack.response(Constants.API_UPLOAD_SHOT_CODE, 0, 'upload complete')
      })
      uploadTask.on('fail', (error) => {
        this.httpCallBack.fail(Constants.API_UPLOAD_SHOT_CODE, 'Invoke uploadFile failed, code is ' + error)
      })
    })
    .catch(err => {
      this.httpCallBack.fail(Constants.API_UPLOAD_SHOT_CODE, `Invoke uploadFile failed, code is ${err.code}, message1 is ${err.message}`)
    })
} catch (err) {
  this.httpCallBack.fail(Constants.API_UPLOAD_SHOT_CODE, `Invoke uploadFile failed, code is ${err.code}, message2 is ${err.message}`)
}