How to Export a Single Element to Another Campaign?

[Warrant2K]

I have two different campaigns created and I'm realizing there are some things I need in both, so I want to Partial Export from one to another, but it's not working.

How can I export People (or any element like a Place or Thing) from one campaign to the other?

I used the export tool but only certain things are showing as available to select. I verified what I want to export has been revealed in case that's a hold up, but I still can't see all of my elements listed as available for export.

Edit to clarify: I am able to export what items show up. The problem is not everything shows as available for export.