This is a tip for Mockups for heavy users of symbols, that shows you how to make an entire set of objects in a symbol linkable.
While doing support this week, someone pointed out that it's not easy to just link a symbol that's a combination of elements, and wrote that they had to overlay a transparent object to make the symbol a link. While you can do it this way, there is an easier way.
Groups support links. So essentially all you have to do to make your entire symbol a link is to nest the elements in the symbol in a parent, containing group. It sounds a little complicated, but it really isn't. This video demo shows you how. (Apologies for the occasional rough audio.)
Give it a try. Hope this helps.