The last thing I learned about these cables is that there are passive and active cables. A passive cable simply passes the signal through, assuming your devices already know how to talk to each other, while an active cable contains a chip inside that converts one signal into another. This matters because HDMI and USB-C are not the same things, nor the same signal. If I were connecting a USB-C laptop to an HDMI monitor, a simple passive-looking cable might work because the USB-C device is already sending a compatible video through DP Alt Mode. But since I was trying to connect from HDMI to my U