how to stack vertical images

Hello,
I’m quite new and can’t seem to find a way to stack images when they are vertical. When I try it stacks but the image has white bars where ground is supposed to be.
I’m using siril.

The photo I get: Screenshot-2023-08-16-at-15-52-52 hosted at ImgBB — ImgBB

Hi @Bloody_fox, and welcome!

And what software might you be asking about?

Have fun!
Claes in Lund, Sweden

Thanks for telling. I edited the comment. I’m using siril.

What do you mean by vertical stacking?
Orientation doesn’t matter. This is just an exif that Siril doesn’t use.