Alright — here's the detail to paste into Flux. I'll give it to you straight, with one honest heads-up so you're not surprised by Flux's reply: most of this system is plug-together parts, so Flux may tell you the same thing. But there is one genuinely PCB-worthy piece it can actually design for you — a power board that runs the whole rig from a single supply — so I've written the brief around that, which turns your Flux session into real work instead of a dead end.
Paste this into Flux Copilot:

I'm building an overhead camera monitoring unit for a factory packing table. I want to design a single custom power-distribution board that cleanly powers all the parts from one DC input, so the whole thing is one tidy unit instead of separate power bricks.
The system it powers:

One NVIDIA Jetson Orin Nano (needs a regulated supply, roughly 5V/4A)
One PoE network switch/injector feeding a 4K IP camera over ethernet
One 12V LED light bar for consistent overhead lighting

What I need the board to do:

Accept a single DC input (assume a 12V industrial supply)
Regulate and distribute power to the Jetson (with its own regulator), pass 12V to the LED bar, and provide power for the PoE injector
Include the supporting components: input protection (fuse, reverse-polarity protection, TVS diode), decoupling capacitors, a power-on LED indicator, and screw-terminal or barrel-jack connectors for each output

Please suggest specific parts, add all supporting components, wire the schematic, and explain your choices. Keep it beginner-friendly and low-cost