Sandisk 8GB Cruzer Switch

I recently got a new flash drive and i want to use it for music. I transferred songs from my phone to my computer and then to the flash drive. But i could only do up to 10 songs that are 2-3 mb each. Help!

It also says i need more space and says i have only 5mb left but everything is empty only 10 songs are saved with nothing else.

It also says i need more space

“It”??  What is “it”?

What does Windows’ Explorer show for free space and used space?