When you click "view source" under a comment with an emoji (button right next to vote arrows looks like piece of paper) you can click that to see the text link and copy + paste that.

For example I just copy/pasted this from one of your lemmygrad comments:

Show

The text for left-unity looks like this:

![left-unity-4] (https://www.hexbear.net/pictrs/image/68b4e09d-1bd1-4616-a9fc-5dffde94e49a.png "emoji left-unity-4")

I added a space between the bracket and parentheses so you could see.

Also I think it's external images that we can't see natively, not emojis I see some banger grad emojis from time to time posted here. And to fix that for HBers reading you can click the fediverse button (between Show Context and Save) to see the image regularly on its home instance.