Select Cloud Storage - UNC Folder provider from dropdown list

In General Settings:

Enter Name of the UNC Folder Mapping.

In Folder Provider Settings:

Please specify the UNC Path (local drive path) for eg: C:\YourUNCFolderName

It will create this "YourUNCFolderName" folder to your C drive

and now you can upload your file through UNC.

After that Please click on Update

Note: If the folder name already exists in Drive(e.g. C:\) then you can use existing folders by adding the same name of folder in Add Folder TextBox in FileManger