In person they stay because you are standing in front of them. On video they decide in thirty seconds. Say what the product is and what problem it solves on slide one.
In person a pause is fine. On video it sounds unprepared. Practice fixes this. Editing does not.
In person, if you lose your place, someone asks a question. On video it just keeps going. Know the point of every slide.
Ten minutes instead of three. Enough time to show your evidence. Ten is the limit, not the goal. Seven is fine.
"Be a scientist when you work, and a snake charmer when you present."
Stand up anyway. A standing voice carries into a microphone the same way it carries into a room. Put the laptop on a stack of books and the camera comes up with you.
Worse on a recording, because nobody interrupts you. A read paragraph runs the whole ten minutes. Know the point of each slide and say it in a sentence.
You cannot point at the screen, so you will want to describe it. Do not. They can see the slide. Tell them what it means and why you chose it.
You cannot ask, and that is a good thing. End on the ask: what you want them to agree to. Then stop talking.