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'Photos' and promised files(?)

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I freely admit my knowledge here is sparse.

If I want to browse and open a photo on a Mac,
and Photos app is handling the images
then I have reports that selecting a picture in the file browser doesn’t actually get me a picture.

I have a nagging feeling that when Photos is involved, what I ‘get’ is a kind of promise, or some URL, rather than a binary file holding pixels.

Am I right, and if so, how do I get hold of the ‘thing’ that Photos wants to tell me about, other than making customers save the Photos image as a ‘real’ file to a ‘real’ location?

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