Geocode to a GPS Route is preferred!!!
The rare necessity to geocode photos by map. This old system is not intuitive nor will it be improved as Geocoding to a GPS Route is less prone to user error.
1) While viewing the photoset ( thumbnail page ) go into settings
Blue wrench icon to the right of the photoset name
2) click
Gecode by Map on a desktop or laptop
very cumbersome on a mobile device without reading/grasping the full process
3) Drag the
Green pin marker to the position you want the photo geocoded.
4) Tap the thumbnail photo of interest in the list-panel
left of the map on desktop, Orange tab on mobile
5)
Geocode to Marker option should now be obvious
hint: tap Geocode to Marker button in preview above list