I am brand new to Cura and to 3D printing so please excuse this very basic question, but I am trying to move my downloaded STL files into Cura by either dragging and dropping, or by pulling the file from my download folder, and neither works. When I drag and drop the file over I see a blank square, but no image moves into the Ender box I see in the Cura. When I try to search for a file Cura doesn't seem to see any STL files - only jpegs and pdfs from my download folder appear in the list.
Can anyone please advise? I have watched a bunch of Youtube videos and they aren't helping.
Thanks!
Nico