Hm, that’s a clue. Can you try following these steps exactly, and let me know what you see?
If it still doesn’t work, can you check the Node Editor to make sure this is what it looks like?
And then check the Attribute Editor under Targets to confirm that this is what it looks like?
Finally, can you open this scene and let me know if this works?
boxtest.zip (45.5 KB)