The preflight operation checks if any rules are violated in the document(s). The set of rules is fixed. All add-ons (stamps, header and footer, bleed tabs, …) and images added by the operator are not preflighted.
If enabled, the automatic preflight operation is applied when a document is being opened, inserted or replaced. You can always apply a manual preflight to an opened document.
A preflight report and an annotated file are generated. The preflight report shows a summary of the problems that have been found. The annotated file shows the complete document with the location of any found problems and fixes. The manual preflight operation automatically fixes the violations according to the configured rules. The automatic preflight operation allows you to fix the violations according to the configured rules or cancel the operation with that document. Some problems are detected by the preflight operation, but cannot be fixed automatically. It is recommended that you fix these problems manually before you print the job.