A portfolio entry built around a screenshot is asking a reviewer to trust that everything below the fold also works. A screenshot proves layout. It does not prove that a button does anything, that a form validates, or that the interaction a hiring manager actually cares about behaves the way the still image implies. The gap between "looks finished" and "works" is exactly what a video closes, and it is the single biggest difference between a portfolio entry that gets a second look and one that gets scrolled past. A reviewer moving through a stack of applications rarely has time to open every linked project, so the entries that survive that first pass are the ones that answer the working question without requiring a click through.
A Figma Make build is well suited to this because the output is a working prototype at a shareable preview link, not a design file that needs Figma itself open to inspect. That link is usually reachable without a login, since most Figma Make projects are prototypes rather than software with a full account system behind them, which means the flow shown in the video is the same flow a reviewer could open and try for themselves right after watching.
