If it’s an empty bubble, it might go away on its own. If it’s a bubble around a speck of dust, it’s a screen protector fail. You’ll need to peel it off, throw it out, and apply another.

needs reapplying, supposedly a good place to apply stuff liek that is your bathroom, you typically dont have dust in there, or as much dust.

They usually give you like 2 or 3 with the pack, if you mess up just start again. These things work better using a hinge method to apply and don’t faff about with it too much. you want to get all the dust off, then immediately apply your screen protector handling as little as possible