Comment insérer le document à la fin du document Word au lieu du début ?

Utilisez le end of content pour obtenir la position finale de l'objet texte.

Voici le script, testé sur Microsoft Word Version 16.13

set FilePath to choose file
my AddAttachmentFileToWordDoc(FilePath)

on AddAttachmentFileToWordDoc(FilePath)
    set f to FilePath as text
    tell application "Microsoft Word"
        set StartRange to (end of content of text object of active document) - 1
        set theRange to create range (active document) start StartRange end StartRange
        insert file at after theRange file name f with confirm conversions
    end tell
end AddAttachmentFileToWordDoc

Une alternative à une plage, vous pouvez utiliser after last character of active document comme ceci

on AddAttachmentFileToWordDoc(FilePath)
    set f to FilePath as text
    tell application "Microsoft Word"
        insert file at (after last character of active document) file name f with confirm conversions
    end tell
end AddAttachmentFileToWordDoc