Vimeo OTT supports 4K/HDR videos on desktop browsers.
We're still working on supporting 4K/HDR on branded apps (iOS, tvOS, Android, Android TV, Fire TV, Roku, Xbox One, Tizen TV. 4K/HDR is not presently supported on these branded apps at this time.
As for 360 and VR, we don't support this on Vimeo OTT just yet. Alternatively, you could always upload the 4K, 360, or VR videos in a zip folder and add it to your Product as an Extra.