vue上传文件一直报错，该配的也写上了，但是一直上传不上去，这是为什么呢？

上传报错：

const uploadFilesToServer = (uploadApiUrl, fileName, files) => {
      let formData = new FormData()
      formData.append(fileName, files)
      // console.log(fileName, files, formData.get('upFile'))
      //添加请求头
      // const headers = {
      //   'Content-Type': 'multipart/form-data',
      //   // 'Content-Type': 'Access-Control-Allow-Origin',
      // }
      let token = JSON.parse(sessionStorage.getItem('token'))
      // const headers = {
      //   Authorization: token.token,
      // }
      //配置头
      const request = axios.create({
        // headers: headers,
        Authorization: token.token,
        withCredentials: true, // 跨域
      })
      console.log(uploadApiUrl, fileName, files, formData.get('file'))
      //开始上传
      return (
        request
          .post(uploadApiUrl, formData, {
            // 'Content-Type': 'multipart/form-data',
          })
          .then((response) => {
            console.log(response)
            // return Promise.resolve(response.data)
          })
      )
    }