Thanks Nik. Photos not reading Xmp files says it all! I have previously had issues with software not reading Heic keywords written by software such as Photo Mechanic. As I understand it, HEIF has some proprietary issues which some software either avoids or doesn’t fully support. Jpeg-XL would seem to solve some off that as “open source” with even better compression and support for 16bit color. I HAVE noticed however, that the increased compression can result in longer rendering time.
gary