HarmonyOS 鸿蒙Next arkts photopicker 选中照片后无法将照片复制到沙盒

import { common } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';
import photoAccessHelper from '@ohos.file.photoAccessHelper';
import { fileIo as fs } from '@kit.CoreFileKit';
@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  build() {
    Row() {
      Column() {
        // https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-file-picker-V5#photoviewpicker
        Button('选择图片')
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            this.example01()
          })
      }
      .width('100%')
    }
    .height('100%')
  }
  example01() {
    try {
      let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
      PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
      PhotoSelectOptions.maxSelectNumber = 1;
      let photoPicker = new photoAccessHelper.PhotoViewPicker();
      photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {
        console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' +
        JSON.stringify(PhotoSelectResult));
        let context = getContext(this) as common.UIAbilityContext;
        let filesDir = context.filesDir;
        let photoUri: Array<string> = PhotoSelectResult.photoUris
        let src = fs.openSync(photoUri[0], fs.OpenMode.READ_ONLY)
        let output = fs.openSync(filesDir + '/1.jpg', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
        fs.copyFileSync(src.fd, output.fd)
        fs.closeSync(src);
        fs.closeSync(output);
      }).catch((err: BusinessError) => {
        console.error(`PhotoViewPicker.select failed with err: ${err.code}, ${err.message}`);
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error(`PhotoViewPicker failed with err: ${err.code}, ${err.message}`);
    }
  }
}