Brother FAX 1920CN - Manual (Page 144)

MAKING COPIES 11 - 11
4 in 1 (P) (MFC-3320CN only)
If 2 in 1 or 4 in 1 copies are in color, you must use letter or A4
paper. For the other Special Copies, you must use letter, legal
or A4 paper.
If you selected Glossy in the Paper Type setting, 2 in 1 and 4
in 1 copies are not available.
2 in 1 or 4 in 1 copies in color are not available with Multiple
Copies.
For FAX-1920C, 2 in 1 copies in color is not available.
For FAX-1920C, 4 in 1 copies is not available.
(P)
(L)
4 in 1 (L) (MFC-3320CN only)