Finish the task without unnecessary steps
Stamp every page with a controlled sequential identifier and continue the next batch without guessing. Open the tool above, choose your file and follow the settings shown. PDFUAE creates a new result and leaves the original unchanged.
Where is the number placed?
The current tool places it at the bottom-right of every page.
How do I continue the next batch?
Use the Next start value shown after processing. Open the output and visually inspect the labels before relying on it.