What I need to put "url" in mapbox addSource - mapbox-gl-js

Question

This is my first time using mapbox and I can't figure out how to addSource when map load.
Below is the sample code.
I uploaded 'KML' file for tilesets and I want to use this tileset for source, but I don't know how to write 'url' part.
I also want to know what is 'source-layer'. What should I write in the 'source-layer?
I am sorry I know this is very basic question, but I really need to know.
Please help me.
Thanks.
map.on('load', function() {
// Add the source to query. In this example we're using
// county polygons uploaded as vector tiles
map.addSource('counties', {
"type": "vector",
"url": "mapbox://mapbox.82pkq93d" <<---here
});
map.addLayer({
"id": "counties",
"type": "fill",
"source": "counties",
"source-layer": "original", <<---source layer
"paint": {
"fill-outline-color": "rgba(0,0,0,0.1)",
"fill-color": "rgba(0,0,0,0.1)"
}
}, 'place-city-sm'); // Place polygon under these labels.
});

Answer 1

EDIT:
Your tile url should also be fine like this:
mapbox://{}
It is a bit tricky to find in the documentation: When uploading KML you are creating tileset for which you should get a map ID. With the map ID you can either request separate tiles using a tile url like this:
/v4/{map_id}/{zoom}/{x}/{y}{#2x}.{format}
You can use the tile url when adding a source
map.addSource({
type: 'vector',
tiles: ['https://api.mapbox.com/v4/{map_id}/{zoom}/{x}/{y}.mvt']
});
Or you can request a TileJSON metadata object and use this to add the source:
map.addSource({
type: 'vector',
url: 'https://api.mapbox.com/v4/{map_id}.json' // <-- tileJSON url
});
For your source layer question: Vector tiles include multiple "layers" of data/geometry, when adding a map layer you need to define which source-layer the map layer refers to. E.g. you can have a single vector tile set consisting of line strings and points (two different source-layers), but your map layer should only render on of them. You can either check to tile JSON to see what source-layers are included in your tile set or create a map style in mapbox studio, using your uploaded tile set as a source.