Problem importing mesh into the Content Folder

Hi, I’ve searched and searched for an answer and cannot figure this out.

I am trying to import a mesh into the Content Folder in Unreal but no matter how I try to import it, the mesh is greyed out so I can’t select it. Do I need to upload the “whole” content folder? Why can’t I just upload a specific mesh and it’s material separately? Please I’m new to this and am stuck. Thanks.