Make a copy for each buyer
Make named PDFs, then check which copy a shared file came from.
Make the copies
Needs a paid plan.
Open Print / Export and choose the pages to include, then Buyer copies…. Type names, paste a list, or import your orders file and choose the name and order-number columns. Check the line on each page, choose where it goes, then Make copies and pick a folder.
If a list cannot be read
If a list cannot be read, check the column choices or type a name first. If saving fails, choose another folder. Stop keeps copies already made.
Check a copy
File › Check a leaked copy… works on every plan. Choose the PDF or picture. The result can identify a buyer copy, not who shared it. A missing mark proves nothing; scans and rebuilt pages can lose it. Buyer names and the copies log stay on this computer; you can delete the log.