Audio download does not work
Download of audio files break with a "NOT FOUND" error in the console for the blob: URL used by the audio player. We can see in Chrome's network log that the decrypted blob: URL is requested twice, with the first request in state "Pending" and the second one resulting in a "NOT FOUND" error. This might be the browser delegating the media to its embedded player UI, which then tries to re-load the media again, and it is possibly why Up1 doesn't see this problem with its own embedded player (only one request in that case, as confirmed by the network log).