In support of an application
Maybe it can add value to George White’s answer to mention that if allowability is disputed by the USPTO, in your reply to, for e.g., an NFOA, or in an appeal to the PTAB (Patent Trial and Appeal Board), you can, by all means cite, for e.g., a YouTube link with a video demonstrating certain facts. For example, if a world record ...
And the form of drawings is tightly controlled, line width for example. In fact you need to petition to be able to use color.
You can hire a patent draftsman or use a computer drawing program to help draw. The book Patent it Yourself has a good section on making your own drawings even if you can’t draw.