Challenge 3: Exporting to PDF Without Updating Fields First — Solution Walkthrough

What a reader of the PDF would see:

The exported PDF is a frozen snapshot of exactly how the document
looked the last time its fields were updated — which was before the
three new paragraphs were added. This means:
  - The Table of Contents shows the OLD page numbers for every
    section that comes after the point where the new paragraphs were
    inserted — every entry from that point onward is now off by
    however many pages those three paragraphs pushed things down by.
  - Any figure captions are unaffected in THEIR OWN numbering (since
    no figures were added or removed), but any cross-references
    reading "see Figure X" would still correctly show the right
    figure number, since captions and cross-references only go stale
    when the ITEMS THEY REFERENCE change, not when unrelated text is
    added elsewhere.
  - The reader has no way to know any of this from looking at the
    PDF alone — a stale Table of Contents entry looks completely
    normal and confidently wrong, pointing them to the wrong page
    with no visual indication anything is off.

The single step that would have prevented it:

Selecting the entire document (Ctrl+A) and pressing F9 to update
every field at once — Table of Contents, captions, and cross-
references together — immediately before exporting to PDF, exactly
the habit this chapter's own warning box recommends as a mandatory
last step rather than an optional one.

WHY THIS WORKS AS AN ANSWER
------------------------------
A PDF export is a permanent, non-interactive snapshot — once exported,
there is no way for a reader to "update the fields" themselves the
way they could inside the live Word document. Any staleness present
at the moment of export becomes a permanent, uncorrectable error in
every copy of that PDF, which is exactly why this chapter frames a
full field update as the mandatory final step before printing or
exporting, not something that can be safely skipped "just this once."