We have seen this case where customer create a deployment on a remote server. During the deployment creation, he gets this message the copy function cannot be used.
This means something prevented the deployment to copy the files from the local computer( or USB Stick) to the remote server where the deployment will be stored.
In our case, it was the Autorun.inf in 3rd Party / SQL 2008 which is used for the Vault Client.Autorun can be blocked by GPO or Antivirus.
The solution was to create the deployment on the local computer and then move the deployment to the remote server using this solution :