Hi there,
not sure this will work for you… but I have recurrent problems connecting to the drive when trying to use it in the native windows explorer file system.
The best way I find is mapping it as a network storage. Using \ipaddress\sharefolder or you can also use the hostname of the NAS. when you do so, it will ask you to authenticate and here is where I have recurrent problems.
The users I have setup on the NAS system do not seem to work consistently. Nevertheless the way I find it working often is to use the following (whenever the “windows credentials” window comes up.
windowsAccount\username.