Windows Media Player: Where are the MP3 Files?

Hi

I just formated my laptop and I have copied mp3 files to
Libraries > Music folder.

Before this, when I copied mp3 files to this folder,they will
be automatically added to WMP.

But now, although the mp3 files are in the Music folder,
they are not in WMP.

Refer to tjis image:


(The are many mp3 files in Music folder, but they are not in
Windows Media Player)

So, how to make sure that the mp3 files are added automatically
into WIndows Media Player?

Grimmjow said:

Library - Include a Folder

Thanks for your reply.

Actually, I have done this before.
The mp3 files will be added in WMP.
But, when I close and reopen WMP,
the files are not in WMP again.

surfasb said:

It should include the MP3s in the WMP library. Check WMP's status bar to see if it is currently adding the MP3s to your library.

I don't understand what you mean.
Where's the status bar?

As you can see in the attached image,
the My Music folder (C:\Users\Username\Music)
is already included in libraris > Music.
So, i don't understand why the files are not
added to WMP.