Using Applescript to get name of current (random) desktop image

I've been searching all over, and can't find code that actually works for this. My mom randomly rotates through ALL of her photos (from Photos app) on her desktop, and very often wants to know which pic she's looking at. I found some cool Applescripts that purport to do this, but it appears that what they actually do is get the first picture in the chosen list of images, not the currently displayed image.

Here's the script that gives all the relevant info (including - supposedly -...

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