How to upload a WEBTOON using photoshop

the comic: https://www.webtoons.com/en/challenge/ludic-b/list?title_no=427749

music is by Dynamix Recordings:
https://www.youtube.com/watch?v=TZnPKznOrPE

its been 2 days since this contest started & I see a lot of people unsure of how to get those webtoons dimensions. this is how I do it

Also saving in JPG means you save a ton of file space

Видео How to upload a WEBTOON using photoshop канала Fascher