Download and install ES file explorer on Android device. Allow sharing on one of your folder on your computer. Make sure they are connect to the same router. On ES file explorer, go to LAN and scan for device on the same network. When your computer shows up, tab on it and enter your computer's login , select remember password so you don't have to enter password every time. Now you can access the shared folder on your computer on your phone. Go back to the phones's storage on ES file explorer, select and copy the files you want to transfer. Go to the share folder again and paste. Now the files will be transfers from your phone to your computer via LAN network.