Currently implemented fbx uses FBX SDK, so it creates fbx scene and than exports this scene using native export SDK function. It has a limit to one animation, the one actually played on your render window (may be changed in the future). Export function creates two files, one binary and one ascii. An ascii file has additional extension to your original file name, e.g. yourfile.fbx_ascii.fbx. Please note, that for some reasons some animation will be played upside down. We are investigating how to fix that problem, looks like Red Engine has some flag to set proper axis directions of their graphic files during render. We don't know it yet.