PX4 Custom Mixer Load

Hello all, looking for help swapping out a mixer file. I’m currently using a copy/paste of the exact file the airframe calls up in order to avoid other issues inside the mixer until I can get it to load. I’ve copied the text file into Notepad ++, set EOL Conversion to Unix, saved as XXXX.main.mix, placed file onto microSD. When I use the NSH command mixer load /dev/pwm_output0 /fs/microsd/etc/mixers/XXXX.main.mix it returns an NSH prompt (no errors) but all RC outputs go to zero. Since the file contents are 100% the same as the original I’m assuming it is a file naming or formatting error. Any help is much appreciated.