Multiple Sources to 1 folder



Hello, I am new to the forum but looking for some help.  I thought I did this correctly but I guess not.

I currently have 2 different video sources on 2 separate drives both with 4k video.  In Kodi currently I have a 4k folder that had the first bunch of videos but my library has grown so I am looking at setting up another folder on another drive to add on to this 4k folder in Kodi.  I thought I did that as I went to the Edit Source option of my folder in Kodi and added the new directory.  The library also updated itself with the new video’s but when I go into the folder, the new video’s are not there in Kodi.  What did I do wrong?

I have also updated the Kodi software to the latest version.

Thank you for your help and sorry if this has been asked.