Have you zoomed the canvas out? Zapplink-to-Photoshop is projecting from screen space so if your canvas isn't fully visible in the ZB UI (which 2k probably won't be unless you have a very high screen res) then it will also be clipped in PS. If you click the actual button, or drag the zoom you'll reveal the entire canvas.
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If you click the actual button, or drag the zoom you'll reveal the entire canvas.