Arse. While traveling recently I used the stock Google Camera app on my phone to take photos. I presumed they'd all be geotagged, and I could load em up in JOSM and add to #OpenStreetMap the things I took photos of.
But it only geotagged a few of them. 😢
I can make Open Camera only take a photo if there's a GPS lock and store that in the photo, but OC is so damn slow. I press the button and it freezes and takes a photo 1 sec later, so I've moved. Google Camera takes a photo instantly.
Then on the map you click either on the point you want to associate a picture with our on your own position marker, go Actions → Take photo.
Downloading seems to be possible only by selecting the pics one by one (tap on) and using the share action.
I have on occasion used it in conjunction with OSM notes.
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