There are following steps for Shared folder problem solution when save in pdf.
Step-1: First of all open settings same as below picture.
Step-4: Click on Virus & Threats Protection.
Step-5: Click on Manage Setting.
Step-6: Click on Manager controlled folder access.
Step-7: Click on Allow an app through Controlled folder access.
Step-9: Click on Pdf software like as "Acrobat.exe" or Nitro.exe.
Now, Restart your computer and check the problem
Step-10: You can see above image. Many time we use preview pane. When we use preview pane means your file is open. So, We can not save it when using from shared folder. This problem occurred in PDF file.
Step-11: How to disable Preview pane?. First of all click on "View" menu and then click on Preview pane or Used short cut key "ALT+P".
Note: If You will want to more information, Please mail me on "info@itsolution4u.in"