mines in lowercase, try that maybe?
The full name of the power is Summon Demonlings - you're missing the 'Summon' part. Put that in there and it should work, otherwise it won't register. The same goes for the rest of the Demon Summoning powers, or any others where the name of the power is two words.
It should work as long as you're directing it to the right location on the right drive. Don't forget the slashes, either. As an example, it might look something like this - numpad1 bindloadfile "C:\Users\namehere\Games\coh\Custom Binds\battledrones.txt" - quotes included. If yours in on B, direct it to the right location on B instead.
This is the guide I personally used to set up my Robotics and Demon Summoning Masterminds - https://paragonwiki.com/wiki/Mastermind_Numpad_Pet_Controls
