The latest version of the Paperspace desktop app is now shipping with 4K support on all Dedicated GPU machines.
All you have to do is plug-in to your 4K-enabled display, check your settings, and go!
Read the blogpost for more information.
Two additional quality of life updates have also been released: the bandwidth adjustment algorithm has been enhanced to improve streaming quality, and key/mouse input capture has been improved to provide a more reliable experience.
You should notice an overall snappier and more responsive streaming experience.