Audio player app robick import audio files from music app or files in dropbox.
When you import audio, an error may occur.
In that case, please confirm it about the following point.
1. Audio file is available in iCloud only
If your song is available in iCloud and hasn’t been downloaded to your local library,
It is necessary to download music to your device once.
* Cloud and arrow icon is displayed at the right of song’s title in music app.
Tap the cloud icon and download audio.
And import this song by robick after downloading.
2. DRM protected songs
Robick can not import DRM protected songs.