Build Platform Beeping

I was wondering if anyone could explain the sound of the build platform raising from the resin tank as its printing. An example would be the sound at the 8 to 10 second mark of this video. . I personal think its just the sound the platform makes as it moves due to the motor but my coworkers have been complaining about it as a beeping noise.

You’re correct – that’s the Z stepper motor raising the build platform so that the next layer can start.