I've been drawing a graphic novel whose page size are 1080 by 1920.I just started posting my works via the medibang app.I just realized that to post a comic,you have a standard page size to use.

What should i do?I'm thinking on resizing the pages i already did but i dont know if that would work out.And if i do resize,what size do i need it to be (web,manga,etc)?