EnivobDude, I have been looking at people recommending this code all morning thinking those were quote marks (yeah, I'm not too observant.) Thank you for pointing out they were backticks.
Another way is to place your wrangle in detail mode and fetch the value of the attribute using a function, instead of a direct reference to the attribute name.
Type this into the Geometry File name: (adjust the path to match the path to your wrangle)Notice the backticks. They are required for the function to be evaluated.`details("/obj/geo1/File_List/","fileName")`
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