Error message while adding File share "UNC Path must be in the correct format" (4381398)

Getting Below Error while trying to add a specific subfolder of a File Share; but verified without folder it works

Sample screenshot without subfolder

Sample screenshot with subfolder

A share path with a subfolder is a specific type of UNC path that includes a subfolder, but it is not the same as the root UNC path.

Make sure the correct UNC Path is used

• "\\FileServer\Share" is a UNC path (points to the root of the share).
• "\\FileServer\Share\Folder1" is a share path (points to a subfolder within the share).

UNC Path (Universal Naming Convention)
A UNC path is used to access shared resources over a network. It follows the format:

\\<server>\<sharename>

Example:
 \\FileServer\Share 

Share Path

A share path is essentially a UNC path with a subfolder specified.

\\<server>\<sharename>\<subfolder>

Example:
 \\FileServer\Share\Folder1