ONLY an engineer would think

"djQ6OTEzMDM0OTA0OTDNjQ1NjovdHJhbnNhYrrRpb25zL1RyYW5zYWN0aW9uOg 470.pdf"

is an appropriate file name.

Rather than, I don't know, name the invoice with the date_invoice-number_client-last-name or something logical like that, we're given a cryptic name that makes zero sense.

Who does this? Engineers.

Who creates the invoices? Small business people, many not tech savvy - where adding this additional step leads to one thing - a mess. The result? Inconsistent invoices sent in emails, stored as PDFs on computers etc.