the camera button doesn't exist anymore (long story, but not actual functionality lost)
You can use highlighting on snapshots. If you click on "Create new Item" and have the "Automatically atach snapshots..." option checked in the general preference, Zotero will automatically create a snapshot of that page. You can open it by double-clicking on the item and will then see the highlighting tools.

So I take a snapshot the amazing highlight option comes up. I highlight away and then move on. I come back and the highlighting is gone. Am I doing something wrong? Should I have saved it somehow?

Cheers!