To enable it, open up your Settings > scroll down to About phone > tap on Software information > and then tap your Build number seven times. If this is your first time doing so, your phone should ...
It has nothing to do with the OnePlus 15's lack of features or general availability; instead, it comes down to form and fit.
Do you see unwanted motion in Google Photos? To go back to your still shots, disable a feature called Motion Photos on your Android phone.