What are your goals? I wouldn't upload your video as a vertical video. Make it a regular horizontal 1920x1080p video. YouTube's algorithm will still push your video this way, considering you'll be making 30-60 second content, easy to gain high retention and engagement. The reason why you don't want to upload your video and have it get counted as a YouTube Short, is because you won't make any money from Adsense.
@PaddyVu is making money from his videos because they are over 30 seconds, and they aren't YouTube Shorts.