I was able to move and scale my wallpaper by turning off the parallax motion.
Go to Settings > General > Assessibility > Reduce Motion "set to OFF"
Next, in Settings > Wallpapers & Brightness > Choose Wallpaper - you should now be able to "Move and Scale" the photo that you've chosen for your wallpaper.
After you've SET the wallpaper, you can go back to Parallax motion by turning Reduce Motion to "ON".