PDF Reports can show PDF documents as images when checked. Select Merge PDF Documents into the report.
Then define Filters and Order for the documents that should be included. Using no filters will include all PDF Documents, all other document types are ignored.
In older reports, select Include PDF documents as images.
Large PDFs, (larger than 2 MB) will significantly slow down the report-building process, and as a best practice, keep PDF's below that size.