Adding Hard Drives to Nvidia shield

Guys , Been hours at this and cant find a solution

I have a 2tb Hard Drive with all my movie rips on it , I have attached it to the Shield , but kodi cannot add my movie folders as a source , the hard drive does not show up!! I have scoured the net and people are saying go into the root file system and select it there…trouble is when i select root file system nothing happens..its like its not accessible…My drive contain blu-ray rips and 4k rips and i want two separate menus for these…i dont want to set it up as a NAS as my internet is not quick enough especially for my 4k content…what am i doing wrong?? i can play them directly by going to the file!! and i dont want to set it up as a library as it just combines all the movies together…I am now stumped…hence this postSad

Thanks