Can't save document to PC on network after W10 upgrade to 14393

I have a home network with a couple of PCs. My desktop is currently on W10 build 10586, while my laptop (which this is about) obviously just got updated to 14393.
Previously I could open a document stored on the laptop from the desktop, edit it and save it back.
Now suddenly I can only open the document in Read-only mode, and I can not save it back to the laptop. I get a message 'You don't have permission to save in this location. Contact the administrator'.

Normally the simplest way to sort this is make sure on the pc you contacting has the same username and password as the pc your logged in to as by default it passes that when connecting make sure you saving to a common folder if its in someone profile it wont let you even on the pc

Why should I need to do that? It did work perfectly well before the update.

Samuria said:

Normally the simplest way to sort this is make sure on the pc you contacting has the same username and password as the pc your logged in to as by default it passes that when connecting make sure you saving to a common folder if its in someone profile it wont let you even on the pc

larsinoz said:

Why should I need to do that? It did work perfectly well before the update.

Because with every new Win10 update things get changed and Broken ...like the debacle with WebCams currently....

Open Control Panel>Credentials Manager>Windows Credential Manager>Add a Credential

and add the Laptop and it's password , and you should be good to go assuming all Permissions are good.

KB.