I think I see where the problem is.Bright Idea wrote:A message saying "example_configurations cannot be added to the sketch" pops up as I drag the whole files into arduino. Except the code files in "example_configurations" folder which are four, I have 57 cpp and header files only under Marlin folder and I'm not sure if all the files are correctly loaded because arduino only displays 48 files maximum.
arduino can only read .h file and .cpp file. You should not drag other type of file into arduino.