HarmonyOS 在应用沙箱内创建目录失败

文档中没有说在应用沙箱下创建目录也需要申请权限，执行创建路失败：

DownloadRelationalStore: Create local rs dir /data/storage/el2/database/local/portscene failed, Error: Permission denied, {"code":13900012}

代码如下：

let actualDir = context.getApplicationContext().databaseDir + '/' + this.getLocalDbFileDir();
if (!await FileUtil.isPathExists(actualDir)) {
  A2pLogger.i(TAG, `local rs dir ${actualDir} dose not exist, now create.`);
  try {
    await fs.mkdir(actualDir, true);
  } catch (e) {
    A2pLogger.i(TAG, `Create local rs dir ${actualDir} failed, ${e}, ${JSON.stringify(e)}`);
    return;
  }

  A2pLogger.i(TAG, `Create local rs dir ${actualDir} success.`);
}