Nucleus internal storage cannot be shown in Windows PC network.
Windows has a habit of forgetting about the existence of non-Windows devices in a Windows PC Network.
Try entering \\Nucleus\
(or \\Nucleusplus\
if you have a Nucleus Plus) into the address field of Windows File Explorer and see if that helps Windows see it. You should see the Data folder of the Nucleus - then you can drill down to the Storage and then to the InternalStorage folder within it.
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