How can I ensure photo folders are synced to iPhone in correct time order?

I'm syncing some local folders so they appear as albums "From my Mac" in my iPhone Photos app. It works, but the ordering is wrong. The files in the local folders are actually symlinks into nested folders on a backup drive (actually a Photos.app library) so the paths are mapped like this example: ~/Pictures/example/A75BB473-E7A7-4B52-A184-6BB6D60AFA41.jpeg -> /Volumes/drive/example.photoslibrary/originals/A/A75BB473-E7A7-4B52-A184-6BB6D60AFA41.jpeg Note that I am syncing **folders** not albums, and this is for good reason. Syncing albums is [broken](https://apple.stackexchange.com/questions/372176/why-wont-photos-import-from-iphone-after-upgrade) for photo libraries on network drives. The photos import no problem, but the order is weird. I can't align it with any ordering I can replicate in the finder. They are *roughly* time ordered based on the EXIF "Date Time Original" tag, but not quite. On the iPhone clicking a photo shows the correct date from the EXIF data, but this is seemingly not being used for ordering. Neither is the file name. The created, modified and access timestamps on the original photos are all the same, so this doesn't seem the principle ordering value either. How does the iPhone sync process determine the order these appear in the album? What can I do to ensure correct time ordering?