That’s the problem – there are no sorting features in Photo libraries. The only choice is to use the Timeline, but that has nothing to do with Playlists.
Feature requests:
Photo library: Sort on "Date Taken" within folders
Ability to sort photo album photos
Requests for help (many unanswered):
Photo Sort Order
Photos sort order
Photos Sort Order
Ordering and sorting slideshow playlists - photos
You can select the order of folders in a photo library, but this has no effect on the photos within folders:
How can I order my photos?
