HP Color LaserJet CM2320 Multifunction Printer series - Manual (Page 71)

Load paper and print media
Tray 1
Tray 1 holds up to 50 sheets of 75 g/m 2 (20 lb) media or five envelopes, ten transparencies, or ten cards.
You can use tray 1 to print the first page on media different from the remainder of the document.
1. Open tray 1.
2. If loading long sheets of media, pull out the extension tray.
3. If necessary, flip out the extension.
ENWW Load paper and print media 59