Epson AcuLaser C9100 Reference Manual page 40

2. Slide the paper guides outward wider than the paper width.
3. Load a stack of long-size paper with the printable surface
facing down by holding the paper with both hands as shown
below.
c
Note:
When loading long-size paper on the MP tray, load one sheet at a
time.
40
Paper Handling
Caution:
Do not curl the paper end when loading it. Feeding curled
paper may cause the paper to jam or to be folded.