Hello Keianhzo, Welcome to the Forums.
The first thing I’d check is what the logs are saying when you see the ‘3 dots’.
In Unreal you can go to Window → Device Output Log → Select your Quest in the lower left.
There’s also software from Meta to see the logs.
It’s been a while since I’ve deployed anything to the Quest, I like to think that this doc should have info that matches what version of the engine you’re using. I’d also give a few recent ‘Deploying to Quest with Unreal Engine’ youtube videos a watch to see if there’s anything you’re missing.