A few of my clients have had trouble sharing files, especially music, after updating to Windows 10 from either Windows 7 or Windows 8.1. It seems that Microsoft decided to turn off file sharing by default in Windows 10 even though you had it turned on in Win 7/8.1.
Here’s how to turn it back on. First, make sure that all the devices that you want to share are turned on and connected, either wired or wireless, to your network. Type “stream” (without quotations) in the lower left taskbar search window and hit the enter key. At the top of the list that pops up you will see “Media Streaming Options”. Double click on it and a window will pop up with a list of network devices. Some media players will show up as unknown device, such as a Sony PlayStation. Put a check mark beside each device to allow, click next at the bottom, follow the directions and you’re done! If your library is big it may take a while to populate the media lists on the now connected device. Rock and Roll!