EDIT:  Nevermind, I think I figured it out.

I just got my Ender 3 Pro last night.  I assembled it and printed the little dog that was pre-loaded.  Print was great!! No issues!!

However, now I'm trying to open some downloaded files into Cura and it's saying the files aren't valid.  This may help but it's saying the files are "zip archive".

What do I need to do so when I open the folder that the files are in....Cura sees and accepts them?

Thanks!

Unzip the file zip file contents first.   .STL files are what you typically load into Cura.   The .zip file probably contains one or more, plus possibly others with readme files, pics, etc.

Unzipping actually creates uncompressed files and/or folders.   Just double clicking on them lets you see the contents, but you have to move those contents into a normal folder before use.

Yup, figured it out.  Thanks though.  First up is going to be some naughty Christmas cookie cutters.  We'll see where it goes from there.

Thanks!