I have tried replicating your steps, but I've had some trouble exploiting that computer glitch. Could you help me with this problem?
the bad news is i may be 1,000 steps ahead of your on video making BUT, the good news is, because i may be an idiot, i have a tendency to do about 900 too many steps.  To take it back to the root of the problem, the first thing you wanna do if you are working on a computer is: find the Export. Find the feature of your computer that actually makes a video file, in 1 file, such as mp4, that you can play in a video player. Everything else is just working backwards from there, figuring out how to change what video it is. Expand the possibilities 1 step at a time. If your video file starts entirely black, the next thing i can suggest is try to make part of it white. If the whole thing is silent, the next step will be to try to make at least some of it non-silent. and take a picture of yourself doing it so you can remember how simplicity works, in case you find yourself in a complicated emergency later on down the road