Are you saying you can not view, download and/or upload 4k footage to/from youtube?
I use an app called 4K Video Downloader. It works for YouTube and Vimeo plus a few others. Here is the site 4K Video Downloader | Free Video Downloader for PС, Mac and LinuxHi guys!
Could you recomend some sources for free downloading and watching online recourses?
Vimeo - want up to 15$ for pro/month
Youtube - ? Didn't find such option, loads where in less than 1080
Any others recourses?