Connection using USB-C to USB-C between monitor and computer is required.
- If USB-C Alternate Mode (DP Alt Mode) is enabled, USB 2.0 is available from the USB downstream ports.
- If video input is via HDMI or DP and USB-C works as an upstream port, USB 3.1 Gen 1 (5Gb/s) is available for the USB downstream ports.
Here is the FAQ video for reference: