Why won't newly added songs show up on my player?

@redford wrote:

Is there a player that dont have file limits and dont seperate internal and sd music?

Unfortunately, not from SanDisk. At least not any of the current ones. If you can find an older model, like Clip+ or Zip, they can combine internal & external memories but they too have file limits, although much higher.

The way I understand it,  the reason for this is that the processing unit (not made by SanDisk) was discontinued by the manufacturer and the current one is shall we say, less robust and feature-filled.