Forgot to ask one more thing, should the scanned passport photos be put onto a Word document, or should they just be uploaded directly as images?
They need to be uploaded directly as images or in a single PDF file - as the guidance states, they will only accept PDFs, JPGs, JPEGs, or PNG files... so you cannot upload a Word document.
Ideally, what you want to do is scan all the passport pages into one single PDF file and then upload that.
Alternatively, what you could do is copy the images into a Word document and then save that document as a PDF file.