Hi Ervin,
Thanks for posting!
Looking at the manual for the Acer Predator Helios 300 series, I’m afraid that the USB-C port supports data transfer only…
Our USB-C docks require that the host computer have a USB-C port that supports both video (Alt Mode) and charging (Power Delivery). The reason why the DisplayPort outputs on the dock function is because these are powered through DisplayLink graphics rather than USB-C video.
I’m afraid I would recommend you to return the dock as this is not a compatible fit.
Sorry to bear the disappointing news.
Mitchell