USB-C
Nearly impossible to know what a device's USB-C port can do from any documentation, anywhere. You have to try all the modes and adaptors. Can it charge and do Data or Video out at the same time? Some can. The alt modes such as Video, ethernet or analogue audio won't work via a hub, yet the device may have only one USB-C port.
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is often that usb-c to hdmi are mostly one-way mode.
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The only two-way HDMI things I've ever generally encountered:
The cables
Couplers
DVI-Adaptors
Some switches, especially two way switches.
ONE portable satellite receiver with built in screen that can do in or out on its sole full-sized HDMI connector, via a button.
I've never heard of a phone, tablet or laptop that can be used as a display via HDMI or USB-C DP (the mode on USB-C that does video is actually called Display Port).
USB-C should never have been for Laptop power In, Video-DP, Analogue Audio or ethernet (all of which it might do on different things). It should have been for data and gadget power alone, up to 20W. It's a mess.
Also tablets should either have two USB-C ports (and all Laptops, Chromebooks more than 1) or one and a optional coax power plug. Most supposed USB -C hubs with Power charge hardly any things with USB-C ports.