While I wasn’t looking (which is often), Apple changed the way photos are stored in Photos.app. It used to be that the original file from your camera was maintained in a folder named ‘Masters’. This is no longer the case. Looking through Photos Library.photoslibrary, you will no longer find anything like ‘IMG_1234.jpg’. Instead, in a folder ironically named ‘Originals’, you will find oodles of files named with a UUID and extended with the original file type (like ‘5A0B2880-8281-4595-95CA-CD62FD80440C.jpeg’).
What I would like to know is how to relate the real original filename to the current pseudo-original filename. Anybody know?