Are the taps working? In other words, when you tap on the screen, does the screen change? Remember, that it is recording the screen, not what your finger is doing, so you have to indicate in the text to tap on a certain button, etc. You can press firmly on the button and it allows you to record your voice with the screen recording as well. See this support document for help with screen recording, How to record the screen on your iPhone, iPad, or iPod touch - Apple Support
From what I understand, there may be apps that allow screen recording and can show a dot where you press, but I'm not aware of what they may be.