HarmonyOS 如何拉起系统相册，选择图片进行上传云端，能否提供个demo或者文档链接参考？

Button("pickImage").onClick(() => { 
  try { 
    let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions(); 
    PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE; 
    PhotoSelectOptions.maxSelectNumber = 5; 
    let photoPicker = new photoAccessHelper.PhotoViewPicker(); 
    photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => { 
      console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' + JSON.stringify(PhotoSelectResult)); 
    }).catch((err: BusinessError) => { 
      console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err)); 
    }); 
  } catch (error) { 
    let err: BusinessError = error as BusinessError; 
    console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err)); 
  } 
})