I have WD my Cloud installed on a dell chromebook. i can watch content from the WD server on the Chromebook. But if i have something on the Chromebook i’m unable to copy and paste it in to theWD folders on the server
Any help would be most welcome

There’s a windows file share plugin for chrome OS that will allow the chromebook to mount the share as a file system. It is my understanding that Google is finally getting around to implementing native support.

Depending on your device, and how new your version of chrome OS is running on it (older devices rarely if ever get modern features on updates), you might need to use the extension. Otherwise, you could possibly get native support with an OS update.