Adding a document cover page will insert a page at the start of each document (much like a separator page). Note: Document cover pages can only be turned on per section, meaning you cannot select individual documents for the document cover pages to be generated for.
First of all, select the section you want the document cover page on.
On the right hand side of the bundling window click 'Properties Explorer'.
Once the Properties Explorer tab is open, tick the checkbox labelled 'Document cover page'.
Bundling will now generate a cover page for each document in that section. Note: Each document cover page will be paginated with the bundle pagination settings.