I've found that I need to specify paths only, pointing directly to the .conf file did not work for me on Unraid v6.12.18
Host Path: /mnt/cache/appdata/mbpfan/
Container path: /etc/
Also, for anyone using a Mac Pro 6,1 Trashcan, below config worked for me. After some frustrations, I decided to undershoot the temps to where I wanted the internal SSD at. Highest is still the highest for CPU. I might refine these later, but I'm totally ok with the fan spinning at full speed 24/7
Current stats:
CPU: 47 C
SSD: 38 C
Fan: 1178 RPM
[general]
# see https://ineed.coffee/3838/a-beginners-tutorial-for-mbpfan-under-ubuntu for the values
min_fan_speed = 790 # put the *lowest* value of "cat /sys/devices/platform/applesmc.768/fan*_min"
max_fan_speed = 1900 # put the *highest* value of "cat /sys/devices/platform/applesmc.768/fan*_max"
low_temp = 40 # try ranges 55-63, default is 63
high_temp = 42 # try ranges 58-66, default is 66
max_temp = 61 # take highest number returned by "cat /sys/devices/platform/coretemp.*/hwmon/hwmon*/temp*_max", divide by 1000
polling_interval = 7 # default is 7 seconds