Good day everyone!

I'm a new here. I tried to upload my first video (both 1080p and 4k), but anyway I got a very-very poor quality with max 720p and a blur picture. Is there any way to upload video in 1080 or 4k (and get 1080 or 4k option in the player here) or how can I get around this problem?

I use QuickTime Player for screen recording, my Android camera for video recording and iMovie for editing if it's important.

Thanks!