Rendering mbtiles on OSM - leaflet

I am new to maps. I want to render mbtiles created using TileMill on open street map using Leaflet. My question is 1)How to render it on maps? As of now I am extracting the images using this command mb-util Fair3.mbtiles ~/Documents/fair3 and then rendering on map using leaflet with following code.
L.tileLayer('static/fair3/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
The problem here is after certain zoom level the tiles are not showing up and there is background(bounding box) which i want it to be transparent.
2)If I upload fair3.mbtiles to Mapbox, how to render tiles from my Mapbox account?

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