Honestly sounds like a job for a Raspberry Pi Zero.
Small battery pack and a USB key, a bit of software setup, off you go.
Install Raspbian: https://www.raspberrypi.com/documentation/computers/getting-started.html#raspberry-pi-imager
Set it up as a hotspot:
https://www.raspberrypi.com/documentation/computers/configuration.html#enable-hotspot
Configure Samba share:
https://www.raspberrypi.com/documentation/computers/remote-access.html#samba
This is fantastic.
Tradie doesn’t want to be watched while they work.
I want to learn by watching, so I’ll hire someone else.
We both get what we want.