Carries video but NOT data for USB peripherals

Ordered this cable to extend a USB-C docking station. While the cable carried the video signal without issue, it did not carry the USB data signals that the docking station had (e.g. keyboard, mouse). I tried using this on a Dell Windows 10 tablet trying to extend the cable for the docking station as well as an Apple MacBook 12" to try to extend the Apple docking plug (USB-C, USB and HDMI). In both cases, I couldn't get any USB peripheral plugged into the respective dock to work (e.g. keyboard and mouse on the Dell dock, wired keyboard on the MacBook). I also tried a completely separate cable and it also failed. So, moral of the story is to very carefully check descriptions and reviews to see if others have successfully gotten USB peripherals working with these extension cables.

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