I downloaded this asset eagerly, and I'd consider myself somewhat savvy with unity and coding stuff, though less so with serial port communication. I can't get Uduino operate correctly with servos. I tested two different servos with simple Arduino examples and they both work fine, with or without external power, but when I get them connected to Uduino, set the correct pin, set servo type, and play with the slider the servo only shudders and jerks erratically. I haven't tested Uduino with a simpler setup yet because I can't find my LEDs, but that's my next (and last) step.
I am on a Macbook running High Sierra, using unity 2018.1, and am using an Elegoo Uno R3.