Dropping a Google or Apple Maps pin

Google Maps:  tap your destination, slide the screen up until you're on the "overview" screen. Screenshot the overview page and upload your picture. If not an identified destination in Google, touch and hold the screen at your point to drop a pin, slide the screen up to again show the overview  screen (coordinates are most important), screenshot & upload your picture. 
Apple Maps:  similar procedures, except scroll up to show the  "details" screen.