Restoring a video back to my iPhone

I have recently purchased and set up My Cloud and would like to use it to save photos & video from my iPhone in order to free up space.  I would also like to be able to restore them back locally to my phone. I can see how to do this for photos using the WD Photos app, but I can’t see an obvious way of doing this for videos.  Can anyone point me in the right direction?

In order to restore a file, you need to explore the My Cloud and copy the file manually back to the iPhone.