I’m seeing that “make” never wants to do anything despite updated notebooks, in the case I have the notebooks in a subfolder.
Do I need to configure something else to make “make” aware of it?
Could you share (a safe-to-share version of) your Makefile, settings.ini, and directory structure?
If you copied the Makefile from one of the fastai projects, you probably have something like this in your Makefile:
SRC = $(wildcard *.ipynb)
That wildcard may need to be adjusted with your folder maybe? But probably other things need to be tweaked as well.
P.S. 
make “make” 
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That was it, thanks! Just edited the wildcard. Sorry, it’s been a while working with Makefiles… 