Canon imagePRESS C1+ Reference Manual page 120

3
Load the paper into the stack bypass.
2
Make sure that the height of the paper stack does not exceed the loading limit mark ( ).
When you use the stack bypass to make copies, straighten out curled papers prior to use, as
shown below. Curled paper may cause a paper jam.
Feeding Direction
2-48
Making Prints Using the Stack Bypass