I can upload videos in that aspect, and when actually playing it (desktop) looks as I want it to, but the video controllers are in a 16:9 shape, and so is the cropped thumbnail before you hit play. And on mobile it keeps the 16:9 ratio so the video is too small, when a 4:5 should look good on mobile with the videos stacked. If I make the video block the right shape, it just shrinks the video inside it right down with a gap top and bottom.