Use the available page-queue controls
The current app lets you rotate, reorder or remove collected pages before exporting. It does not edit embedded images inside an existing PDF.
Prepare changes before importing
For pixel-level image edits, edit a copy in a suitable image editor first, then add the finished image to the scanning page queue.
Save and inspect a new PDF
Export the arranged pages to a new file and check the result. Keep the original document unchanged.
The current Windows product directory lists the supported free applications. It does not offer an installer for this absent product or function.