Odyssey sends a Utah Fits All receipt back when it is missing any of seven things. Drop your receipt here and this tells you which ones it can find, and highlights where. Nothing is uploaded: the reading, the checking and the AI all run inside this browser.
Save the findings as a manifest, then open the combiner to merge these files into one PDF with the highlights burned in. The combiner reads the manifest and puts every box back where it belongs, even if you reorder the pages.