How to cached songs on music tube?

On my iPhone I downloaded an app called music tube. You need Internet to download songs on to the app and you don't need Internet to listen to them. Once the song has downloaded it says cached on an iPod. But on my iPhone it says add to playlist. But when I'm not on the Internet it won't let me play the songs and it won't cached it. Does anyone know how I can fix it?

"Cache" is just temporary. The moment you turn off your iPhone, the Cache is gone.
Therefore what you need to do is "download" the music. Adding a Cached song to a
Playlist will only store the link -- not the music -- and that playlist too may disappear
when your turn off your iPhone.

Do how do you download it

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