Help with playlist~ in standalone application

I'm attempting to add a sound file to playlist~ in a standalone application by sending it an [append] message.

When playlist~ receives the message it opens the file browser as expected, however no matter what type of sound file I try to import, only the name of the file appears in the playlist~ object, there's no waveform and the file will not play.

There has been previous reports of issues importing audio into playlist~ embedded within a standalone application, is anyone else having this issue or aware of a fix?

Ideally I'd like the playlist~ to 'save' the audio files that are in it when the standalone is created so I don't have to manually add them when launching the standalone.

Cheers,

Mark.