I have scanned some 10,000 negatives to which I have added quite a bit of NLP metadata.
The final destination is Mac Photos.
Using NLP export, some fields show in Photos as part of the caption but others are lost
Specifically:
Film format (35mm, etc) is lost
Lcation (Sublocation, City, State, Country) is written to EXIF but is not read by Photos
Date is written to EXIF “Date/Time Original” but l didn’t find which EXIF field it should be copied to so that Photos reads it
Normally, not much is displayed, and if you press command-I, a separate window will provide more information. Upon import, no metadata should be lost, but is buried in Foto’s database/catalog and some of it will come back upon export. So far so strange.
The best way to find out how to make metadata from visible in Fotos is … to try.
To test, I set metadata in the source app and see what Fotos will show. Here’s an example checking DxO PhotoLab and Fotos.app. You can test the same things with LrC/NLP metadata. Note that I added metadata according to the respective field name. Like this, I can also see what fields are used - and how they might be localised.