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Question: What's this?

Whenever I start a print job, although it doesn't interfere with the actual printing, I wonder what this is all about:-

User uploaded file

Then, immediately, the printing progress bar starts and the print is delivered into the out tray as normal.

Does anyone know what it appears for?

iMac (27-inch, Late 2012), macOS High Sierra (10.13.1)

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User profile for user: makey

Question: What's this?