Add->Existing Files … doesn't seem to recognize Photos app

I am trying to add some photos to a folder in the Research folder in the binder.

I right-click on the folder, select “Add” and “Existing Files…” and click “Photos” under the Media option on the sidebar of the Open dialog sheet. When I do, the only two photo browsers that appear are iPhoto and Photo Booth; Photos does not appear. The Photos app does appear in the Open dialog sheet in other apps (Chrome, Safari, Word, etc.).

Any ideas why? Did I miss a step somewhere allowing Scrivener to use the Photos app?