Cannot play 4K video

I have uploaded a 4K .mov file but when I try to play it I get audio and a very small window with no video. I am running NC v 18. Is this a known limitation? If so, is there a workaround?

Apparently this was reported 8 months ago, but AFAIK has not been fixed.

4k works fine for me when recorded from my phone.

4k works fine with me from the jellyfin test files here.

Please be more specific on your issue.