When I want to scan the document at work, I don't have time to be with the driver.
I used to try to scan documents with my phone, but found that I couldn't keep my phone stable and horizontal and get a picture that I wasn't embarrassed about.
Luckily for me, there was a wood shop in the high school I worked for, so I just took one of my shelves to the store, throw a big Forstner bit into the drill and make a hole in the shelf.
I bought a cheap, fast and simple document camera.