Why is my footage blurry when exported to Youtube
Novice film maker/editor here. My raw footage in iMovie is either 1080 or 4k and looks fine in iMovie. I utilize the internal iMovie export to Youtube feature and my videos are blurry, pixelated, and not sharp when I play them in Youtube. When I export from iMovie to Youtube I make sure the quality dropdown is set to the max resolution and when I play the video on Youtube I have the quality set to the max as well. Even when I come back several days later the Youtube footage remains the same poor quality. It makes my 4k video look like it's playing in 720p. I watch other Youtube videos in 1080 and they're crystal clear. What am I missing?
iMac 21.5" 4K, macOS 10.15