Which media can be used in the printer trays?
The printer supports plain paper ranging from 75-89 gsm, thin paper from 65-74 gsm, and heavy weight paper from 90-120 gsm. It also supports labels and envelope sizes (such as №10 and C5) within specified dimensions. (Page 7)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 7
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