Do M4A Files Work with Fusebox?
As of now, M4A files are not officially supported.
The full player only currently supports feeds that use the MP3 file format. If your episodes have been encoded in M4A format, you may find that the feed doesn't load in the full player.
The track player and sticky player may work with M4A files, but we can't guarantee that it will. Your best bet is to make sure that all your episodes have been encoded as MP3 files.