If you want to use a custom tile server as the base layer of your map, you must provide the embed URL for your desired map provider in this field. By default, this field contains a free access link to OpenStreetMaps (https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png).
In most cases, you can find the required URL in the documentation or technical wiki of your desired map service. Here are some examples:
Certain tile servers may require an API key to verify the license for map usage. If the map provider requires authentication, Drill Down Map PRO will not display the base layer until a valid API key is provided in the API Key field.
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