Flash drive connection to Roku tv.

I have a 55”LED ONN Roku tv and have connected a flash drive with videos. I followed prompts and launched onto Media Player. I get a folder which gives me the option of selecting either LG Smart TV or Lexar Data Shield. I chose Lexar Data Shield which is the flashdrive. I then get a folder that says contents. I select contents and get 3 options MAC OS. Resources Code Signature. For each one that I select I get message of no compatible media found. Any suggestions?

Keith S