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Hi, I am trying to store persistent changes to the photo library. I know I can use a PHPersistentChangeToken to get the changes since that token, but I am not sure how to serialize this object and save it into a file. I am also wondering if you can serialize a PHPersistentChangeFetchResult and store that in a file. Cheers.

I would like to use a third-party app to edit the metadata of a photo to change its Caption and then be able to search in the Photos app to find that image with the edited caption. I have managed to do this by duplicating the photo with the edited metadata. The Photos app recognizes it as a new photo and indexes it with the new caption, making it searchable. However, when editing the photo in-place, the Photos app will not re-index the photo, therefore it will not be searchable. Is there a way to edit photos in-place and have them searchable with the new metadata?