Try to make sure the External drive is shared and also make sure the permissions are correct when you go to property ans security on the external drive.
Hi there, as a moderator I am only here to provide guidance, moderators are simply here to facilitate and oversee the Community. If you have a question or issue related to the WD Community itself, us Moderators will be happy to respond and assist you. However, if you are looking for technical support from WD, you will need to contact them directly.