Can’t add USB drive as file source

I am using Krypton 17.1 on an android TV box, and am trying to add my USB drive as a file source for Kodi, however when I go to the file manager and choose the “Add source” option I don’t see my USB drive listed. Kodi has no problems seeing my USB drive when I go to install a zip file from the same USB drive. Is there a way to configure Kodi to see my USB drive when I am trying to add a source?