What paper sizes can I use in Tray 2?
Tray 2 supports standard paper sizes such as A4 (297 x 210 mm) and Letter (216 x 279 mm). Custom size ranges from 76 x 127 to 216 x 356 mm are also supported. See Table 1 for details.
From the official HP Color Laserjet Pro M280 M281 Multifunction Printer manual, page 3
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