https://developers.weixin.qq.com/miniprogram/dev/api/file/FileSystemManager.saveFile.html

我使用camera拍摄照片，然后调用下面的函数，把拍得的照片另存为localPath，然后重新拍照片再调用下面的函数，期待新的照片替代旧的。但是无论如何，那个localPath渲染出来的总是旧的照片。哪里用法不正确吗？

saveLocalFile: function (tempPath, localPath) {
    FSMGR.access({
      path: localPath,
      success(res) {
        console.log('FSMGR.access.success, res=', res)
        FSMGR.unlink({
          filePath: localPath,
          success(res) {
            console.log('FSMGR.unlink.sucess, res=', res)
            FSMGR.saveFile({
              tempFilePath: tempPath,
              filePath: localPath,
              success(res) {
                console.log('FSMGR.saveFile, success res=', res)
              },
              fail(res) {
                console.log('FSMGR.saveFile, fail res=', res)
              }
            })
          },
          fail(res) {
            console.log('FSMGR.unlink.fail, res=', res)
          },
        })
      },
      fail(res) {
        console.log('FSMGR.access.fail, res=', res)
      },
    })
  }