4k videos only being shown in 1080p

Ebb_And_Flow42

Estimable
Jul 21, 2015
2
0
4,510
I uploaded a video to YouTube in 4k but once it had finished processing the video was only available in 1080p, I checked the file to see if Premiere Pro had exported in 4k and it had.
video link
There's a link to the video in question.
If anyone can help me out it would be much appreciated.
Thank you.