some offline songs in playlist aren't played

[Chanpakong]

Hi all,

I've downloaded all songs to my phone. All songs have the green downloded icon. But whenever I start my playlist it steams instead of obtaining songs from sd card. So when I turn my internet off or set offline mode some songs cannot be played. Please advise the temporary solution for this issue. My version is 5.3.0.995 

Phone: s7

Thanks!