Your device may not have enough storage space to hold all your files you need, or maybe you just like to stream movies or music stored on your computer to your phone, or you can just see your documents you just updated on your computer in your android device. Then here is how you can do it, what you will need is a computer connected to LAN network and android device connected to same network over WiFi.
Download and install this File manager app from Google Play store on your android device.
And now check your computer”s IP, read HOW TO KNOW YOUR COMPUTER IP?[WINDOWS]
Now as you know your computer IP, note it down.
Now, open your Control Panel and Continue reading Access files from computer on android devices over WiFi