This file is a symlink to examples/FastLED_NeoMatrix_SmartMatrix_LEDMatrix_GFX_Demos
https://github.com/marcmerlin/FastLED_NeoMatrix_SmartMatrix_LEDMatrix_GFX_Demos

If you can please symlink it to
examples/FastLED_NeoMatrix_SmartMatrix_LEDMatrix_GFX_Demos/neomatrix_config.h
as the copy here is likely out of date, although should be working.
I'm not allowed to symlnk them because the arduino library manager does not allow 
it, but do it locally if you can.

You should be able to get it via
git pull --recurse-submodules

If this does not work, just get 
https://github.com/marcmerlin/FastLED_NeoMatrix_SmartMatrix_LEDMatrix_GFX_Demos
and manually pull/copy neomatrix_config.h

This file is externally maintained with all the demos I have there because it 
allows those demos to work on around 10 hardware backends, including this library.

If you find it's way too big and scary, you can use the shorter matrix_config.h
instead, which provides the basic functionality without all the ifdefs, but it's
also missing some common code used by some of the demos, so if you want all the
demos to work, you really want to use neomatrix_config.h

Please look in the file for RP2350_INTERSTATE75W_64BY64 and RP2XXX_PROTOMATTER and notice
how Sublime_Demos and Table_Mark_Estes69 have neomatrix_config_whichdefine.h
to set which config you want to enable without having to change the full
neomatrix_config.h for each demo

Your Protomater supported display is not an Interstate 75W? 
Not a problem, find the define for RP2350_INTERSTATE75W_64BY64, make a new code block 
for your display with RP2XXX_YOUR_DISPLAY and then set that define in
neomatrix_config_whichdefine.h in each demo that uses that hardware and resolution

Enjoy
