Windows 10: "You do not have permission to modify files in this network location." multiple users,...

Hello,I have rather troubling issue, banging my head for over few weeks now. I will try to be as much detailed in my explanation of the issue. There are number of users in different environments some are using Azure AD joined devices profiles, some domain joined profiles, some are local profiles. They all have issue when saving pdf/office documents from Chrome/Edge/Outlook to Desktop/Documents folders. All get the same error message: "You do not have permission to modify files in this network location. Contact the administrator per permission to make this changes". So if user clicks at first

:)

 

Unable to save files correctly to network share with read & write permission

Saving any file to network share folder brings up an error message:
z:\test2.xlsx
"You don’t have permission to modify files in this network location.

Contact the administrator per permission to make these changes"

Facts:

1. Saving any file to the local PC is fine
   
2. This issue happened only when user have permissions (Read & Write) but when I give modify permission its working fine.
   
3. A file with the correct name and extension is created but it is 0kb. If you save the exact same
   

file again and try to overwrite the 0kb file then the document saved correctly the second time .

1. When I tried to use 'Simple Tools' such as notepad also have the same symptoms
   

(only able to create 0kb file initially, and then when you save a second time it saves correctly).

 

File and folder sharing between multiple network location users

Sadly, this thread was locked with no answer except the one both I and the OP of that thread expected to work but that didn't (stopped at step 12).

I have two computers discoverable on my home network as Hazel-Desktop and Hazel-Laptop. I would like full access to both devices' files from either device. Both C drives are mapped and discoverable and appear in File Explorer with viewing rights (per permissions for Everyone group) as expected.

At this point, I expected to be able to go to Properties > Sharing > Advanced Sharing where I thought I could add appropriate permissions for users from network locations (share Hazel-Desktop\C with \\Hazel-Laptop\Users and vice versa), except I cannot select the network location from Advanced Sharing. I can only see the local device.

Is this possible?

 

File permissions for another user

Still no joy. Test User can still write to the file. *Sad
This are the steps I have done;

1. Created file in User account
2. Copied file to Test User account
3. Signed into Test User account
4. Right click file
5. Properties > Security > Edit > Add Test User > Allow Read > Deny Write > Advanced > Change Owner to Administrators > To Remove User account had to disable inheritance which removed all accounts except Test User and Administrator
6. Test User can still write to the file!!

Still stuck. Test User still has full control of the file, he can write, modify, cut, copy, paste in fact as if the permissions had not been changed. *Confused
Administrators permissions