I linked two SharePoint lists. They are joined by column ID (like a foreign key).
When I click the Display Item of List #2, it also includes the fields of List #1.
But I can't figure out how to display the attachment from List #1. Any ideas?
This is not possible using out-of-the box list views.
An alternative - insert a list view web part on a page, and then insert a "related lists" web part.
A programmatic approach: http://www.martinhatch.com/2011/08/how-to-programmatically-add-related.html