Job Title Doesn’t Include Reading Titles

(I am fairly new to the company. I am assigned to help the chief engineer update some safety documentation for existing and new equipment.)

Engineer: “[My Name], why have you changed all the details in the early part of this document you’ve sent me? That’s still relevant!”

Me: “That’s the document for [new equipment], not [old equipment].”

Engineer: “How was I supposed to know that?”

Me: “It’s in the filename of the document.”

Engineer: “Oh, you can’t expect me to read that.”

Me: “…and the title page of the document.”

Engineer: “…hmm.”

Me: “…and the e-mail you opened the file from.”

Engineer: *incoherent muttering*