Good morning, I have been exploring the function of the Photon for a while and have added two files (FILE1.c and FILE1.h) into the firmware (firmware/hal/src/photon/). I am now attempting to call a function from the file from the user directory (firmware/user/applications/FILE1) with no success - I get “Undefined reference to FILE1.function1()” when trying to make the firmware with “sudo make PLATFORM=photon APP=FILE1 MODULAR_FIRMWARE=n” ran from the firmware/main directory. I believe this is because the standard makefile is not including my new .c and .h files in with the binary, and I assume there is some makefile wizardry that I need to modify to enable make to include the files. I have been looking around the various makefiles in the project with little luck. Could anyone point me in the right direction?