Decks from SharePoint and Microsoft 365 carry customXml items (document
library metadata and content types), docMetadata/LabelInfo.xml (the
Microsoft Purview sensitivity label) and docProps/custom.xml. All were
dropped on save, so a labelled corporate deck came back unlabelled. They
are now kept verbatim with their content types, their own relationships
(itemProps) and the root or presentation relationship linking them. Kept
parts never replace a part the writer makes.
Co-authored-by: Cursor <cursoragent@cursor.com>