How to save a custom map

I made a map and saved it as in my documents folder but my question is simple...how do I use it? I understand there is more to it, but what? Do I have to extract the files or something?

 

I don't think I did....but what the hell do I know, let me check to see.

 

No, I added stuff to the plain grid map then I saved it as and nothing loads when I load the grid map. I saved it to the documents folder, do I move the files that were saved to the grid maps folder? Really what I want to know is what I have to do to the files because there is only one files out of the multiple it saved I recognize.
To make this easier to understand I took a screenshot of the folders and their content.
Beamng's folder inside documents...https://prnt.sc/hlcaxl
Levels folder inside beamng's.....https://prnt.sc/hlcb2s
Contents of the maps' folder, map is what I named the saved files......https://prnt.sc/hlcb5y
--- Post updated ---
Ok, so I fingered it out. I went to a map, made a new level, saved as, transferred the files from the template file it made, and loaded the map. However the ground is black? Like it has no texture? How do I fix this?

 

Ok, so I fingered it out. I went to a map, made a new level, saved as, transferred the files from the template file it made, and loaded the map. However the ground is black? Like it has no texture? How do I fix this?

Yeah I got it figured out, thanks.