As inferred by #173, HEIC doesn't support storing IPTC and exiftool annoyingly doesn't warn you but silently drops the keywords being stored.
I would suggest therefore that the contents of XMP Subject ought to also be added to keywords during metadata read, or one could load XMP Keywords even though it's non standard.
As inferred by #173, HEIC doesn't support storing IPTC and
exiftoolannoyingly doesn't warn you but silently drops the keywords being stored.I would suggest therefore that the contents of XMP Subject ought to also be added to keywords during metadata read, or one could load XMP Keywords even though it's non standard.