There are air bubbles after replacing the cover of my phone. What should I tell the repairman about?

You can go to him and talk to him, because he is definitely not repairing it well. Well, there are still bubbles after replacing the screen. That is because the outer screen and the inner screen did not have a good film to stick on, so, just Go to him and talk to him, and say it in a gentle way, and solve it. This is the easiest, so there is no need to be angry. Go and find out how to solve it, right? Don't be angry yourself, just leave it at that.