To copy large files from H/D to the device I have found a way to do this, still time consuming but better than the network system. First thing is to put all the files into one folder (I put about 20 MP4 films in) then connect the H/D direct to the the “MyCloud” USB 3. I then use the WD My Cloud PC App to move the folder from the drive to my “public folder” After the files are transfered I then move them out of the folder.
This method seems to be a lot quicker than the ethernet method, I have hundreds of films to load up from H/Ds so if anyone knows a faster way please advise.