Olivetti d-COPIA 255MF Operation Manual page 262

Advanced Function Settings > [Mixed Size Originals]
Example: B4 and B5
NOTE
• When mixing the original sizes as using the following combination, make sure to set "Auto Detect Original
Size" to [On] for "Folio".
A4-R and Folio
Auto Detect Original Size (8-12)
• Loading Originals in the Document Processor: up to 30 sheets
6-8