I've been trying the Opi 4B with my Nexdock, and using the official Ubuntu 18.04 image was able to get power + display over USB-C, however that's it - no other USB functionality was working over USB-C, only over the other USB 2.0 ports. So that made my Nexdock kindof useless. Armbian fared even worse, only having power over the USB-C port.
ogun owo gbewa to daju