Random PDF files won't attach

[rc211e]

Recently (last week) members have reported some (not all) PDF files failing to attach
Specs.pdf fails to attach.
Test.pdf from https://xenforo.com/community/threads/pdf-files-wont-attach.195835/
loads without an error


When attempting to attach dialogue runs but doesn't identify as pdf




Pressing F12 and selecting the Console tab showed these errors


Please help
Random PDF files won't attach

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