What worked for me - enabled recycle bin for each of my shares. I found that you MUST have deleted something to proceed, if you haven’t then the location doesn’t exist. In Windows Explorer right click and choose add network location. My MCM has the default name so I entered - \\WDMyCloudMirror\Recycle Bin - Volume_1
I have 3 shares and I know that number 1 is called “Camera” so I named the new location “Recycle Bin - Camera” and it works.
If you empty the recycle bin and then try to open it again it will fail as it has ceased to exist.
I couldn’t see a way to restore a file to it’s original location but I was able to play/copy/save to new location a short video that was in there so it’s more of a temporary backup as I see it.
I’ve set the recycle bin to empty automatically after 3 days, enough I think to realise that I want something after all