how to get wired video working through the USB C port

https://support.google.com/pixelphone/answer/2865484#479992E is the ONLY official documentation that Google provides. To make wired video work, you need to:

1. have a Google Pixel 3 phone or later
2. buy a compatible hub that supports DisplayLink
3. install the DisplayLink Presenter app
   • DEFINITELY read the reviews for this app, there's lots of details there that you won't find anywhere else.

Docks / DisplayPort adapters reported to be compatible:

• Diamond BVU3500H
• Dell D3100
• WAVLINK USB 3.0 to HDMI [others] [others]
  • other docks — [1] [2] [3] [4] [5] [6]
  • other adapters — [1] [2]
• CableCreation USB 3.0 to HDMI Adapter with DisplayLink

Docks that have been reported to be incompatible:

• Dell D6000
• Lenovo ThinkPad docking station

future phones that might support external monitor without a 3rd-party app

• it was originally planned for the Pixel 8, but was scrapped Ctrl-F for "DisplayPort" and "desktop mode".
  • see also — broader discussions about Android's "desktop mode" [1] [2] [3]