I think he's talking about posting the same attachment twice...
Here's a suggestion; since you aren't allowed to post the same attachment twice, just go back to the post you made where you attached it the first time, and see where it says (Post #1) in each post people make here? Just right click on that, open in new window, and copy the url, then post the URL as a link so people can just click on it and it will take them directly to the pic you want them to see...