Circle V2 API Docs
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    PDF_READER_UNAVAILABLE_MESSAGE: "We couldn't start the PDF reader, so this template's fields couldn't be checked. This is a problem on our side, not with your file — please try again in a few minutes."

    A reader that never started has said nothing about the file, so the copy must name us as the cause: upload and detection both used to answer this failure with a verdict on the document ("password-protected", "unreadable"), sending users hunting for a problem in a PDF that was fine.