When I use %ft as a subdirectory name in the file naming template, I always seem to get Light even though shooting darks, biases and flats.
That's odd. I can't seem to duplicate this. My frame type is whatever I have in the "Type":
If you can provide a sequence and some logs we can take a look.
Never mind, pilot error. I also had Target Name as a sub directory. A target was Calframes and the calibration frames were being routed there. Sorry!