Panasonic KV-S5055C Operating Manual page 20

Operation
For documents with mixed page sizes and thicknesses
Document thickness
Document size
20 Operating Manual
The ratio of page thickness between the thickest and thinnest
pages must be less than 1.5.
The ratio of width and height between the largest page and smallest
page must be less than 1.5.
Example: If the smallest page is A4 size, then the largest page can
be up to A3 size, and if the smallest page is A6, then the largest
can be A5.