MacBook Pro 2011 cannot create 4K video
I have a 2011 MacBook Pro and I am getting in video creation. I’m currently using my iPhone X and GoPro Hero 6 black to record video, and using iMovie to edit. When I export my videos I only have the option to choose up to 1080p. I’ve read about iMovie using the first clip to set the format (why???), and have made sure to put a 4K video as the first clip but still no option to export as 4K? Is my iMovie hosed, or my MacBook just to old?
MacBook Pro