Saving the file.
I get that you have to use the Viewport Render Animation instead of the normal render options and I can do that and get the animation I want from that window. But how do I save it to mp4? It seems like It's just a preview. I can't find any option to output it. It looks like I could save individual images and do it frame by frame then put them together in a video editing software but that sounds really tedious. There must be a better way.