I've uploaded a few music files (.mp3 and .ogg, no DRM) via the Ubuntu One REST API. (I'm writing a python library that uses it.) The Ubuntu One Music app on my Android phone doesn't pick up on these files. (They do not appear in the library after requesting a Refresh, not even under "Unknown artist".) Similar files uploaded via the official client, on the other hand, get picked up immediately.
Is this somehow expected behaviour, and I'm just missing the explanation? And how can I work around it?