[ Beta's figure is flitting around the machine excitedly, she's having a blast ]

So, this is mostly speculation based on what I'm seeing, but!

[ she moves to grab something and then appears at the window again to toss a roll of film to Aloy quickly ]

Before the invention of holos or a computerized medium, they had rolls of material that captured the images frame by frame. From the way this looks, they would have had to set this all up by hand to run...So they'd take the long strip, feed it into the machine, and...

[ there's a flash of light on the screen as she adjusts the projector before it begins to kick on. ]

It'd run every single image through at high speed!