Instagram does away with the square aspect ratio for multi-photo posts ...

WILL NICHOLLS, PETAPIXEL:

Back in August 2015, Instagram introduced support for landscape and portrait orientation images. This was great news for photographers, as getting rid of the forced square aspect ratio stopped the need for ugly crops. Earlier this year they introduced the ability to upload multiple photos at once, but this brought the return of the square aspect ratio.

[And now] Instagram is removing the forced aspect ratio of these multiple photo posts too. But you’ll need to pick whether you want to share a set of portrait or landscape photos.

Read more, here.