Show that a file or PDF has already been printed before.
I was thinking that a feature similar to the one that shows that an email was responded to but for files or PDF's that have already been printed. This would save a lot of paper and the old " I printed it out already and gave you the invoice argument".
Mario P. commented
you need special licensing for this feature: https://www.undocumented-features.com/2018/05/10/atp-safe-attachments-safe-links-and-anti-phishing-policies-or-all-the-policies-you-can-shake-a-stick-at/