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See also How are Images represented in the Model?,How to access Access images after changing the default namespace?

The uploaded image files are identified by a combination of URI and filename. The URI is used as the principal identifier so we don't need to worry about collisions if two people each upload an image named "image.jpg". The filename is retained so the user can use their browser to download their image from the system and it will be named as they expect it to be.

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