How to Stop Photos Copying Images & Creating Duplicate Files in Mac OS X
Photos app is a great app to manage and browse large collections of pictures on a Mac, but some users prefer to manually sort their pictures using the file system of OS X, which means that if you add those pictures into Photos app they will be copied into the Photos library. That’s the intended behavior, but essentially that means Photos app defaults to creating duplicates of pictures that are manually added through the Finder or Import function, as the original picture stays in it’s origin location, but then a copy of the image is duplicated into the Photos Library.photoslibrary package in the user Pictures/ directory. By disabling the Importing feature, you will be able to use Photos app as a front-end photo browser to an existing folder hierarchy of images.

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