qtdragon mod

I copied your file to the Screens folder, ran LCN, but no additional PINs appear in Show HAL. What am I doing wrong?

Did you try this?
Look for the heading : 2.8.2. Handler Patching - Subclassing Builtin Screens
linuxcnc.org/docs/stable/html/gui/qtvcp....cp:modifying-screens

Look for the direction on handler file placement.

Running linuxcnc from the terminal can give more info too.

Thanks, it was just a file location error. The new pins are showing up now, but from what I understand, I need to modify the Qdragon UI to use them? Or how can I use these new pins?

You should not need ui changes for these pins to work.
There is a description on the pins on the page before this one.