线上一直用对象存储上传图片都很正常，但是最近客户反应图片老上传失败，，返回undefined，，，求解答

   wx.chooseMedia({

      count: maxNum - currentNum,

      mediaType: ['image'],

      sizeType: ['original', 'compressed'],

      success: (res) => {

        console.log(res, '图片');

        res.tempFiles.map(v => {

          let fileUrl = v.tempFilePath

          wx.compressImage({

            src: fileUrl, // 图片路径

            quality: 80, // 压缩质量

            success(url) {

              console.log(url, '2222====================')

              let filePath = url.tempFilePath

              if (filePath) {

                var Key = util.getRandFileName(filePath);

                wx.showLoading({

                  title: '正在上传...'

                });

                cos.postObject({

                  Bucket: config.Bucket,

                  Region: config.Region,

                  Key: currentDate + '/images/' + Key,

                  FilePath: filePath,

                }, (err, data) => {

                  wx.hideLoading();

                  console.log(data,'data==========')

                  if (data && data.Location) {

                    console.log('https://' + data.Location)

                    let V_BACKGRADE = 'https://' + data.Location

                    var imgList = that.data.imgList

                    imgList.push(V_BACKGRADE)

                    that.setData({

                      V_BACKGRADE: imgList,

                      imgList: imgList

                    })

                    console.log(that.data.imgList, 'imgList')

                  } else {

                    wx.showToast({

                      title: '上传失败',

                      icon: 'error',

                      duration: 2000

                    });

                  }

                });

              }

            }

          })

        })

      }

    })