Media Player not updating with new music

Do you happen to know why my m4a music files will play on Windows Media Player and Media Center, but not through the Music Library? I have the "Optional Media Update"...

Corrected when trying to stream music on my XBOX One from my PC using media player app, I do this because playlists are also playable, the music files are no longer found. Video files and picture files are still able to be streamed. I am wondering since
the add of music to onedrive and xbox music did they remove the ability to stream music with media player. on another note the media player on the One is awful compared the players on the 360.

Got a little more info for you! Looks like as of the most recent update, you CAN Snap the "Media Player Preview" and play music, however un-snapping it will end the current music!

It may be the DNLA update if so download the media player and you can stream movie, pics, and music from your PC or a USB!!

Hi! I'm Luis, a fellow Xbox Gamer . Thanks for reaching us out here.

You can listen to music on your Xbox 360 console by connecting a portable media player, inserting a CD, or playing music from your console’s hard drive.

-From a portable media player:

Connect your media player’s sync cable to a USB port on the Xbox 360 console. There are two USB ports on the front of your console behind an oval door.

Press the Guide button  on your controller.

Move to Media, and then select Music Player.

Select Portable Device.

Select the music you want to play.

-Rip a CD

Load a music CD into the console disc tray. The music player starts automatically.

Select Rip CD.

Select the songs you want to copy to the hard drive, and then select Rip CD.

-Music while playing:

You can play music from a portable music player or your hard drive while playing a game. Here’s how:

Plug the sync cable of your portable media player into a USB port on the front of your Xbox 360 console.

Start a game, and then press the Guide button  on your controller.

Go to Media.

Choose Select Music.

Select the location of the music you want to hear (hard drive or a connected media player).

Press the Guide button  to return to your game.

Your music will play in place of the game soundtrack if the game supports custom music.