So, in the past couple of days, I found the following:
- On my MacBook Air, if I right-click on an image that comes up in a Google search in Safari and select “save to Photos,” Photos rejects it as an unrecognizable file format - most likely .webp.
- If I click on that same image and open the web site where it resides and then right-click on that same image, chances are Photos will accept it. At that level it appears that some images have been saved as .webp and some are still saved as .jpg.
- In any case, a .webp image that’s been imported to Photos on the Mac will not sync to my iPhone.
I haven’t run the same kind of “test” using my phone but I’m reasonably sure the results will be similar.
So, except for the grey images in the phone I feel like I’ve figured out what didn’t seem to be going right in the first place. I can only imagine how many images that were “accepted” into my Photos library and never were synced to my iPhone. Not sure I have the gumption to go looking around.
Thanks a lot for your responses. They got me looking at my problem in a way I might not have envisioned before.