This article shows how to view mbtiles files in MapTiler Desktop offline. Open the files in MapTiler Desktop by double-clicking any mbtiles file and you will immediately see its content with a base map in the background providing context.
When you close the preview, it is possible to directly upload such a map to a web hosting, like MapTiler Cloud or Amazon S3. Alternatively, you send your map into a mobile device with the MapTiler Mobile app.
With TileServer-PHP you can host any MBTiles also on your own server. See TileServer-php tutorial.