Hi Lulu.
Yes and no. The Google Maps plugin is available for
gallery layout captions in both X3 PRIVATE and PRO, but is only available for the
X3 POPUP in X3 PRO. See
X3.25.0 release details for more info.
The reason you don't see it in your global caption settings, is because we made [maplink] only available on a per-page basis. Instead, navigate to
PAGE settings > gallery > captions, and you will find the [maplink] option for inline map buttons.
If you also require map links in the POPUP
[screenshot] [see demo], you would need to consider
upgrading to X3 PRO ($65).