Best aspect to post on Insta

Simple but effective advice;

If I post 4:5 aspect, my photo gets much more space and hence exposure on the feed.
So crop your photos like this!

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Hmm, I just cropped one 4:5 in Lightroom, emailed it to myself, uploaded straight from the email and it wasn’t given the space a 4:5 photo should get.

Any idea what the issue is here?