Geotagging with Photos or other app
You can use HoudahGeo to write location information back into the original image files.


Using the media browser in HoudahGeo, add the photos to a new project
HoudahGeo will ask about camera clock settings. Click OK, you don’t need accurate timestamps for this procedure
Select EXIF/XMP export from the Output menu
Use the following settings:


Uncheck “Selected images only”
Check “Geotagged images only”
Tag: “Original images”
Uncheck “Create copies”. Be sure to have a backup
XMP Sidecars: “Write to sidecar if present”
Uncheck “Notify media library”
Select Coordinates and other properties you want to export
Be sure NOT to export timestamp. You did not give HoudahGeo accurate information on the camera clock setup



Full disclosure: I am the developer of HoudahGeo.