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I suppose that

I'm using SageMath 8.2 on a Windows 10 Native with Jupyter Notebook.

means that you have used Erik Bray's Windows/Cygwin installer.

Well, Cygwin is pretty peculiar about its file access. If you want to save somewhere on an network drive, you must manage to give Cygwin access to it. Not really obvious. ISTR that I managed to create some sort of symbolic link (Windows ? Cygwin ? Can't remember at the moment).

But there is more : The Jupyter notebook can access only the directory it's started from (in other words, you can(t climb uptree...). In your case, that means that you have to start "from" your network drive (bloody unlikely IMHO) or somehow create a symlink from your directory to your network drive. I haven't the slightest idea about whether this is possible in Cygwin or not.

Sorry to be unable to be more precise : ATM, I have neither Windows harware connected to a Windows server nor a functional Windows VM....

I suppose that

I'm using SageMath 8.2 on a Windows 10 Native with Jupyter Notebook.

means that you have used Erik Bray's Windows/Cygwin installer.

Well, Cygwin is pretty peculiar about its file access. If you want to save somewhere on an network drive, you must manage to give Cygwin access to it. Not really obvious. ISTR that I managed to create some sort of symbolic link (Windows ? Cygwin ? Can't remember at the moment).

But there is more : The Jupyter notebook can access only the directory it's started from and its subdirectories (in other words, you can(t can't climb uptree...). In your case, that means that you have to start "from" your network drive (bloody unlikely IMHO) or somehow create a symlink from your directory to your network drive. I haven't the slightest idea about whether this is possible in Cygwin or not.

Sorry to be unable to be more precise : ATM, I have neither Windows harware connected to a Windows server nor a functional Windows VM....

I suppose that

I'm using SageMath 8.2 on a Windows 10 Native with Jupyter Notebook.

means that you have used Erik Bray's Windows/Cygwin installer.

Well, Cygwin is pretty peculiar about its file access. If you want to save somewhere on an network drive, you must manage to give Cygwin access to it. Not really obvious. ISTR that I managed to create some sort of symbolic link (Windows ? Cygwin ? Can't remember at the moment).

But there is more : The Jupyter notebook can access only the directory it's started from (Edit : and its subdirectories ) (in other words, you can't climb uptree...). In your case, that means that you have to start "from" your network drive (bloody unlikely IMHO) or somehow create a symlink from your directory to your network drive. I haven't the slightest idea about whether this is possible in Cygwin or not.

Sorry to be unable to be more precise : ATM, I have neither Windows harware connected to a Windows server nor a functional Windows VM....