How to modify and save a map?

My goal was: to modify Gridmap and make a huge slope in the middle of it. So I launched the game, chose the proper map. Then I opened editor with F11, created that slope, and of course pressed "Save as...". Some files were made and I moved them to Documents\BeamNG.drive\mods\levels. After launching BeamNG, I could see that map in menu, but it didn't load. Tried that multiple times, without success.

PS Other topics, like that one, haven't helped me at all. They only explain where files are created, and I know it. But how to load them?

 

So Try to explain it as best and easiest I can . First of all launch the Game and go to grid map or where you want to modifie any thing . If you have finnished click just on the tab "save " not "save as.." then close the game and go to Windows /Documents / Beamng.drive /levels ( First time I created a map there was no levels folder so create one if it doesnt exist) then copy that folder inside levels . If you changed sth. On Gridmap it is called gridmap ,if you changed sth. On derby it is called derby ... so copy it and go to the folder where you gridmap is in . Mine is in beamng / content / levels .. and Paste your copied File right there . It have to replace some files so just click on accept. (Gridmap is a Standard Level so if it dont overwrite sth. Just Zip the gridmap) hope that Helps ..