Based on the info in this thread here: Youtube shorts upload instead of youtube videos
From @samliew 's answer -
I added #shorts to the Title, #shorts to the Description, and “shorts” as a Tag in the Module settings.
YouTube API documentation in Stack Overflow says that isn’t necessary but I tried anyway.
Still get “Processing abandoned” error on YouTube, and the video appears in the “Videos” section of my channel with an error, not in the “Shorts” section.
I’ve tried multiple times, every video is 43 seconds - 55 seconds long.
What to change in the Upload a Video module settings here?