.MKV Not shown in Kodi

Hello, relatively new Kodi user here. No serious problems the last 2 years until now. I have a MKV file that Kodi will not show in its explorer, thus I cant add it to my library. Its a valid MKV that plays fine and is not corrupted. Only thing I noticed its an older MKV encoded in 2010 but I dont see why that would matter. Im using Kodi on Fedora 24. Any ideas?