[BUG] Android single apk

I have installed my apk and obb file to store. Is there anything more to do? Because when I install my game from store, it seems it only installs apk, not obb. I’m sure I have add obb package too. Is there anything required else like writing a code into app to download obb? There are lots of threads about this situation. If you are not tested it so far, people will think there are some serious problems in UE4 with Android like me which I don’t want to.