You can add video and audio files in MP3, MP4, WMV and MOV formats. If you have any problems, pease check the file name and try simplifying it to something than only contains letters, numbers and the - and _ symbols.
Some corporate networks and devices can block file uploads, so check with your IT team to make sure you have the required access.
If you are still having some problems adding media files get in touch with our Support with the details and we can look into it with you.