Symbolic link to coppermine area
In TNG, you can browse the ‘photos’ subfolder on the server, to pick up the photo and thumbnail of interest. A symbolic link to the coppermine/albums folder works nicely. When the time comes, a symlink to the albums/genealogy/headstones folder should work for headstones.
The result is that the original import into the coppermine gallery creates the thumbnail etc., and then all becomes accessible to TNG.