This adapter is designed for HDMI output, not input. It allows you to connect your USB-C enabled device to an HDMI-enabled display, such as an HDTV or monitor, but it does not support using a laptop as a monitor through the USB-C port.

In other words, you cannot use this adapter to receive video input from another device and display it on your laptop; it is only for sending video output from your laptop to an external HDMI display.