iMovie won't export in 1080p
I'm using video footage from two sources. One is my MacBook Pro's screen, which is 2560x1600, and the other is my iPhone's rear camera, which is 4k. Neither of them are below 1080p, yet iMovie won't allow me to export to 1080p.
I doubt it's hardware limitation, since this is a $2000+ laptop. It has 16 GB of RAM, 1 GB of video memory, and 500 GB of storage.
Does anyone know why iMovie won't export in 1080p? TIA.
MacBook Pro w/ Touch Bar (2018 or later)