For props.style.backgroundImage, you have to wrap the image URL with url(’’) like so: url(’/system/images/{path you copied}’)
You’ll notice that this is the same syntax as CSS background-image properties. That is because under the hood, we are mostly using css to realize styles.
Edit: looks like you do not have to wrap the url in url(’’) - still works for me when I set props.style.backgroundImage to /system/images/{path you copied}