Hey,

I just got to using scatter amend. I cannot figure out in what form it wants x 
when everything is boxed. It whines about length. My case is:

y is boxed array of shape 3 3 3 3
m is a boxed array of shape 3, ultimately selecting 21 cells, a face, row, and 
column (if you "9 9$," the y)

For x, I've tried:i.21
<"0 i.21
<<"0 i.21
i.21 1
<"0 i. 21 1

I tried with 27 too, in case it does 3 runs of 9 each.
MWE:
Q=:i.3
9 9 $, (???) ((1;1;Q;Q);(Q;Q;1;1);,(<1;Q;1;Q)) } <"0 i.4#3

Non-scalar value don't work. What am I doing wrong?
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