Adding to Movie library

I have OSMC running on a Raspberry PI 3 in my RV. I was using a USB stick drive for my movies, but it’s too small so I tired a 5 TB laptop hard drive. It spins up and is accessible via the file system. I can even play the movies from the listing, What I can’t seem to do is figure out how to get this folder added to the “Movies” section where I can browse by cover art etc. I’m obviously missing something right in front of me. A similar question, If instead of using the spinning hard drive I wanted to use 2 or more USB stick drives, can I have multiple drives merge into the movies library?

Thanks!

Adding a spinning rust drive to your library is no different than thumb drives. You can add as many sources as you want and they will show up together in the library.

https://kodi.wiki/view/Adding_video_sources