merging fixture

Ok, this is driving me nuts...

I need to merge the Nitro 510 into a show as it is not in the library.

I downloaded it and placed it into the shows folder, but when I go to merge I can't see it.

If I go through the file browser there it is, right where expected.

I do this all the time on Hog 3 with no issues. I was expecting to be able to select libraries from the drop down menu in Source Location but it is not an option.

Am I just being an idiot?

Using Hog4 PC.

Leggy.