Hey, i figured out what the problem was: USB-C Prioritization Allows you to specify the priority to transfer the data with high resolution (High Resolution) or high speed (High Data Speed) when using the USB Type-C port/DisplayPort. Default: High Resolution. I changed it to High Data Speed and now i can do 4k[NAME] + USB 3.1 So, it was a simple setting  Thanks!    
Hi, Referencing this thread. I'm using same display U4320Q via USB-C. Source: Microsoft Surface Studio Laptop. Cable: original Dell one that came with the monitor. As per here Microsoft Surface device is HBR3 capable. [IMAGE] Still, the Link Rate is HBR2. I did not know about this until I plugged in a USB to RJ45 card for better speed and noticed 230 Mbps speeds. Same happens with a MacBook Air M1. Is there a firmware update or am I doing something wrong? Thanks!
U4320Q, 4K 60Hz, Microsoft Surface Studio Laptop