HarmonyOS 鸿蒙Next：不同应用程序间文件分享问题，能拉取应用但分享失败

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/share-app-file-V5#%E5%88%86%E4%BA%AB%E6%96%87%E4%BB%B6%E7%BB%99%E5%85%B6%E4%BB%96%E5%BA%94%E7%94%A8

按照官方的参考案例进行根本无法实现文件分享，不知何故，请教大神。

应用1：进行文件分享

let pathInSandbox = this.context.filesDir + “/test.txt”;
// 将沙箱路径转换为uri
let uri = fileUri.getUriFromPath(pathInSandbox);
console.log(“result—>”, uri)
let want: Want = {
  // 配置被分享文件的读写权限，例如对被分享应用进行读写授权
  flags: wantConstant.Flags.FLAG_AUTH_WRITE_URI_PERMISSION |
  wantConstant.Flags.FLAG_AUTH_READ_URI_PERMISSION,
  // 配置分享应用的隐式拉起规则
  action: ‘ohos.want.action.sendData’,
  uri: uri,
  type: ‘text/plain’
}
this.context.startAbility(want)
  .then(() => {
    promptAction.showToast({ message: “分享成功！” })
  })
  .catch((err: BusinessError) => {
    console.error(Invoke startAbility failed, code is ${err.code}, message is ${err.message});
  });

应用2：根据应用1中分享的uri获取文件内容

export default class EntryAbility extends UIAbility {
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    let uri = want.uri;
    if (uri == null || uri == undefined) {
      console.info(“result---->”, ‘uri is invalid’);
      return;
    }
    try {
      let srcFile = fs.openSync(uri, fs.OpenMode.READ_WRITE);
      //读取文件内容
      let bufSize = 4096;
      let readSize = 0;
      let buf = new ArrayBuffer(bufSize);
      let readOptions: ReadOptions = {
        offset: readSize,
        length: bufSize
      };
      let readLen = fs.readSync(srcFile.fd, buf, readOptions);
      while (readLen > 0) {
        readSize += readLen;
        readOptions.offset = readSize;
        readLen = fs.readSync(srcFile.fd, buf, readOptions);
      }
      const decoder = util.TextDecoder.create(“utf-8”);
      const str = decoder.decodeWithStream(new Uint8Array(buf));
      console.info(‘分享的内容为：’ + str);
    } catch (err) {
      console.info(‘分享错误：’ + JSON.stringify(err));
    }
  }

  onWindowStageCreate(windowStage: window.WindowStage): void {
    windowStage.loadContent(‘pages/Index’);
  }
}

并且在应用2的module.json5中添加配置如下：

{
  “actions”: [
    “ohos.want.action.sendData”
  ],
  “uris”: [
    {
      “scheme”: “file”,
      “type”: “text/plain”
    }
  ]
}

但是发现应用2中这个uri一直为空字符串，但是在应用1中这个uri内容是存在的为：file://com.example.first/data/storage/el2/base/haps/entry/files/test.txt，这是什么原因？