Can't create linked projection

I’m trying to project an edge of a rectangle (effectively, mounted on a “wall”) down to a plane on my floor. I want it to be Linked, so when the rectangle is resized, that resizing is reflected in the edge projected onto the floor.

But I can’t get the “Linked” checkbox to work. (I click it ON; it jumps back to OFF.)

What are the criteria for getting that Linked checkbox to work?

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What message does it show in the top middle of the screen?

To link anything, you must ensure that the sketch you’re linking from is below the object you’re trying to link to in the action list.

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Hi,
Here a video.

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