This Windows issue was first traced in Windows 8 64-bit machines and on Windows Server 2012 network drives were not populating within Microsoft Deployment Toolkit>New application>Browse. This may happen on Windows 10 also.
It happens when you use programs that run in "Run as administrator" mode - Elevated Programs (as configurators) or Installers.

It  can be fixed by forcing Windows to make the network drives available to standard and administrator accounts:

1. Run regedit.

2. Locate HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System

3. Create a new DWORD entry with the name EnableLinkedConnections and Value 1.

4. Restart the computer.

Now you can see and use network drives with these installers or applications.