I'm quite upset about this actually. Just bought a M1 mini and planned on using my UPerfect (strange brand name, great screen) 4k portable monitor with it. I was excited since the HiDPi worked fine with the 2013 MBP I'm replacing. Then I connected it to the mini and... no options as others have reported. Surely someone from Apple has heard about this and if they are reading this, I regret buying the M1 mini, I should have bought an intel version... How can you say the M1 is superior when it cannot even be used to write an email? Apple used to be the reference in how UI is easy on the eye. This is the exact opposite. I guess I have to waste money on a 1080p monitor now... forget about 4k. Thanks for the half-baked product Apple...