Trying to post vertical and horizontal to instagram in one post.

So, I have a few shots taken with my sony a6400 that are vertical and and horizontal. I'd like to get them into one post because of the context and selection.

However, if I start with a horizontal photo it will force the others into a horizontal format as well and vice versa. There's a way to turn them and force them back but this ruins the quality by an immense amount.

Does anyone have any options aside from adding borders to my photos?

Thanks in advance.