Any data is transferred directly to the watch via your local network connection (it is not transferred via the web server over the Internet). The watch must be connected to the same WiFi network as the device displaying this page.
Please type in the address shown in the "File Transfer" screen on the watch.
{s}, {z}, {x}, {y} and {q} are replaced by the subdomain, zoom level, x/y coordinates and quad-key respectively.
See OpenStreetMap Wiki: Tile servers for some examples.
Please make sure you are adhering to the licensing terms of the tile server used.