How do I Load A .json From/For A Tile Map

Its simple its a map maker u make a map u press save and an other dude can download the file and load it but whatever i find isnt working or isnt helping in any way, if someone could just show some pictures of how to set this up i would be so happy.

fileconvoy.com/gf.php .CAPX

Thank u i wanted it to trigger when pressing "load" so the following setup worked:

Thank u.