Another great one is this documentary of the Fitz Roy Traverse by Honnold and Caldwell. It’s a high alpine adventure rather than a free solo, but it’s a different sort of amazing achievement to watch unfold.
Another one, even though it's not about Alex per se, but about Brad Gobright (another great climber who loves to free solo) I'd recommend watching "Safety Third". It's on vimeo[0] if anyone is interested.
https://www.redbull.com/int-en/episodes/AP-1MQAPEZX91W11