I am also able to reproduce this issue. I was unable to find any updated
bug threads, so apologies in advance for a depracated update to this
report.
The .m4a files in question all came from YouTube, via youtube-dl. I also
cannot duplicate the issue with .mp3 files.
1) Output of 'lsb_release -rd'
It appears the option to even add an online account is completely
nonexistent in Quantal for me. That's after going into dconf editor and
changing the "did-initial-setup" value to false. It would be nice to get
some news on the status/concern of this particular bug and what the
plans are for future
