How to save external hard drive

I am a beginner with skills (retired sysadmin and code developer)

Have a Pixel 10 and Sony AR7, with macro lenses, for DIY fishing fly/lure making. I have an audience too, with a 40 year span of magazine articles.

I can split the output signal from either device, so I can watch a live stream of my hands making things, on a big monitor, as I do.it.

I can save a video stream to an external hard drive too, by tedhering the camera from a linux box, with Entangle or GPhoto.

QUESTION:

Is there a way to control a camera from a phone--so the signal STILL saves to an external hard drive?