waydroid or uengine

If you have access to app store, you can download Android apps which use UEngine (Android 7.0) as the engine. The use of UEngine is similar to Anbox. You can also config it through UEngine runner. Additionally, you can choose Waydroid. There is also Waydroid runner.

The Android app I'm trying to install is the new xapk format. After I extracted the xapk using WinRAR, I could install the apk inside with UEngine. But how about the obb file? How or where do I place it?

EDIT: I'm a little disappointed. I moved the obb file to UEngine/data/Android/OBB. The game finally launches but crashes when it tries to contact the server for update. Perhaps UEngine does not provide internet connection to the app?