调用showAssetsCreationDialog保存图片报错（HarmonyOS 鸿蒙Next）

需要先保存到沙箱路径下，才可以保存到图库

import { common } from '@kit.AbilityKit'
import { BusinessError } from '@kit.BasicServicesKit'
import fs from '@ohos.file.fs';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { fileUri } from '@kit.CoreFileKit';
import { buffer } from '@kit.ArkTS';

export function myRawfileCopy(context: common.UIAbilityContext) {
  context.resourceManager.getRawFileContent("background.png", (err: BusinessError, data: Uint8Array) => {
    if (err != null) {
      console.error(`open aaa.txt failed: ${err.message}`)
    } else {
      let buffer = data.buffer
      console.log('myRawfileCopy path' + context.filesDir)
      let file = fs.openSync(context.filesDir + '/test.png', fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE)
      try {
        fs.writeSync(file.fd, buffer) // 拷贝文件到沙箱，为了简便，这里是直接getrawfilecontent然后写入，当文件过大时内存压力会很大，如需优化，可通过buffer进行读取
        fs.close(file.fd)
      } catch (err) {
        console.log('myRawfileCopy error')
      }

    }
  })
}

let context = getContext(this);
let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);

async function example(context: common.UIAbilityContext) {
  console.info('ShowAssetsCreationDialogDemo.');

  try {
    // 获取需要保存到媒体库的位于应用沙箱的图片/视频uri
    let srcFileUris: Array<string> = [
      fileUri.getUriFromPath(context.filesDir+ '/test.png')
    ];
    let photoCreationConfigs: Array<photoAccessHelper.PhotoCreationConfig> = [
      {
        title: 'test2', // 可选
        fileNameExtension: 'png',
        photoType: photoAccessHelper.PhotoType.IMAGE,
        subtype: photoAccessHelper.PhotoSubtype.DEFAULT, // 可选
      }
    ];
    let desFileUris: Array<string> = await phAccessHelper.showAssetsCreationDialog(srcFileUris, photoCreationConfigs);
    let file1 = fs.openSync(context.filesDir+ '/test.png', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
    let arrayBuffer = new ArrayBuffer(4096000);
    let readLen = fs.readSync(file1.fd, arrayBuffer);
    let buf = buffer.from(arrayBuffer, 0, readLen);
    console.info(`content of File: ${buf.toString()}`);
    let file2 = fs.openSync(desFileUris[0], fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
    let writeLen = fs.writeSync(file2.fd, arrayBuffer);
    fs.closeSync(file2);
    fs.closeSync(file1);
    console.info('showAssetsCreationDialog success, data is ' + desFileUris);
  } catch (err) {
    console.error('showAssetsCreationDialog failed, errCode is ' + err.code + ', errMsg is ' + err.message);
  }
}

@Component
@Entry
struct Index {
  build() {
    Column() {
      Button('拷贝文件到沙箱').onClick(() => {
        myRawfileCopy(getContext(this) as common.UIAbilityContext)
      })
      Button('保存到').onClick(() => {
        example(getContext(this) as common.UIAbilityContext)
      })
    }
  }
}

请问，解决了吗，我也遇到这样的问题