City/state/country metadata is useful descriptive information, but it is not equivalent to a GPS geotag. Apps that show maps or organize photos geographically typically rely on latitude/longitude coordinates, then reverse-lookup the place name from a map service.

So if you want the photo to behave like a geotagged image across apps, you should add GPS coordinates. If city-level precision is enough, a practical approach is to assign a single coordinate within that city—often a point near the city center—to all relevant photos. That gives mapping systems the exact coordinates they need, while still keeping the location only as specific as the city.

In short: the City field alone usually won’t make other apps show a map or treat the image like a geotagged file; GPS coordinates will.