How do I share a post or comment to someone on another instance so they can view it from their account?

If I want to share a post with someone from another instance, it looks like I have 2 options:

1. I can share how my instance links to the post, which is the little link symbol.
2. Or I can click the federated symbol and that apparently shares a link from the poster's instance.

In both cases, whoever I share the link with is unable to view that post from their account if they're on another instance. Is there a way to alleviate this?