For Reorder: Specify the new page order (e.g., "3,1,2" moves page 3 first, then page 1, then page 2)
For Delete: Specify pages to remove (e.g., "2,4,6" removes pages 2, 4, and 6)
For Extract: Specify pages to keep (e.g., "1,3,5" keeps only pages 1, 3, and 5)
Examples:
• Single pages: 1,3,5
• Page ranges: 1-3,7,9-12
• Mixed: 2,5-8,10,15-20