Nebula Capsule Max and audio playback from usb

I just got the Capsule Max and tried playing various .avi and .mkv files, it says audio is not in a supported format. What are supported formats / codecs or is there any update that can be done to rectify this? Having to convert files all the time does not sound very appealing…

Below are the details:

Video Formats Supported :
H.264, H.265, VP8, VP9, DivX 4x/5x/6x

Audio Formats Supported: MPEG-4 AAC, MPEG-4 HE-AAC, MPEG-4 HE, AACv2, AAC ELD, AMR-NB, AMR-WB, FLAC, MP3, MIDI, Vorbis, PCM/WAVE, Opus