I suppose the types of images we habitually post are a bit different in both intent and shape.

There seems to be a maximum vertical height automatically applied to inline images. So if you’ve got something tall that also includes text (like yours does) it may wind up illegible. I run into this with the Owl House strips frequently posted here. Since I’m a desktop nerd, I just right click and open the image in a new tab, then do with it what I will.

The stupid but effective solution would be to split each horizontal row of panels into separate images and post them sequentially. That’s a lot of extra work, though.