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A battery icon with a warning on it appears in the system tray to indicate that a slow charger is connected, and the battery is discharging. One of this docking station’s limitations is that the HDMI and DisplayPort connection can only support 4K displays at 30Hz. Make sure the device or dongle is connected to the USB-C port on your PC (or phone) that supports the features of the device or dongle. This Apple KB (section System requirements and compatible Mac models, paragraphe before the last one) says no, but does not specify Mini-Display Port.
What Is DisplayPort Over USB-C and How Does It Work? - MUO
The USB-C connector is the next generation USB interface and it will appear on devices such as Smart Phones, Tablets, PCs, Notebooks, Docking Stations, Displays, and Peripherals. Perhaps the connector was meant to act as a blank canvas for various data and power transmission interfaces to apply their technology. Make sure your PC, the external display, and the cable all support DisplayPort or MHL alternate modes. DisplayPort over USB-C enables the USB-C connector and cable to support the DisplayPort interface for audio/video (AV) transport capability.Of the four features listed, only connector reversibility is a feature inherent in all USB-C connectors/ports. If the HDTV has a DisplayPort input, then a USB-C to DisplayPort adapter cable can be used to provide DisplayPort display capability.
USB-C Introduction: What is USB-C DisplayPort (DP Alt Mode) USB-C Introduction: What is USB-C DisplayPort (DP Alt Mode)
The benefits of doing so can be immense, allowing you to organize your workflow and tasks in ways you couldn’t imagine doing so before.Whereas USB-A connectors have to be plugged into their ports in a specific orientation, the symmetry of the oval shaped USB-C connector head, along with the pin configuration within it, allows the USB-C connector to be completely reversible. Needless to say, the ample connection interfaces mean you will be able to use all the connections seamlessly, be it connecting your headset or SD card.