P2720DC, Samsung S6 Lite tablet, USB Type-C, not recognized

@Linda2009  Video output over USB-C, called DisplayPort Alt Mode, is an optional capability of USB-C ports, and not all devices with USB-C ports support it. A bit of Googling I did just now indicates that the S6 Lite does not support it.

Thanks for your info. So I'm a bit puzzled about this monitor....wondering WHAT devices it does connect to using USB C.  So far my Huawei P10 and Samsung S6 Lite are no good.  I did a lot of research and read a lot about  how monitors with USB C are the way of the future. I looked for an affordable USB C monitor but I'm realising my mistake was not to find out EXACTLY which devices this monitor can connect to using  Display Port Alt Mode.  

@Linda2009  Many laptops have USB-C ports that support video output these days.  The same is true of at least some tablets.  The iPad models that have USB-C ports support video output, for example.  But this capability is less common on tablets and especially on smartphones as compared to laptops, I suspect at least partly because smartphone and tablets have historically relied on wireless "casting" to external displays rather than a cabled connection so that the device doesn't have to remain anchored to the display.  Displays with USB-C are indeed the way of the future, especially for people who will be using such displays with laptops, where the additional benefit of providing power to the attached device means the display can essentially act as a docking station for laptops without having to buy a docking station.  Dell even has some USB-C displays now that include Ethernet, which can be used by a laptop attached by USB-C, because Ethernet is still important in business settings, and therefore a display that can provide an Ethernet connection to an attached system may completely eliminate the need for a separate docking station in many common desk setups.

But displays also tend to be connected to laptops and desktops much more often than to tablets and smartphones.  If your use case will primarily involve using a Android-based tablets and smartphones as source devices, you might want to look into something like the Microsoft Wireless Display adapter.  It plugs into the HDMI input of any display/TV, and then you just need to connect it to a USB port or wall charger for power.  At that point it acts as a wireless display receiver that supports Miracast, which is supported on Android devices (and Windows devices).

Thank you very much for responding to my query. I appreciate it. I guess it is not mainstream to want to connect a tablet/phone to a monitor. I may look into the Microsoft Wireless Display adapter. Overall I'm very happy with the monitor and reviews led me to believe that you just plug and play any USB C device.  Thanks again.