Correction. The WPLMS S3 plugin plays the audio but does not stream it. If I wait about 10 seconds before I click on play it starts playing. If I click play before that then it wont play at all. It seems like the plugin downloads the whole file and is then able to play it. Another problem is that iOS thinks it's a video (the course setting has to be video as audio isn't supported yet) and because of that opens a fullscreen video player that is whole black and then even the UI hides and you only see a black empty screen.
The native audio tag doesn't work at all.