"App preview dimensions should be: 1600x1200, 1200x1600."
Do help me resolve the above error message I see when I 'Choose File' for 'App Previews and Screenshots' at the iOS App 1.0 Prepare for Submission page. I created an App Preview using iMovie 10.1.12 on MacOS Catalina 10.15 Beta
length 00:00 / 00:04
filesize 1.4MB file-format .mp4
Thanks in advance,