Before uploading an overlay you will need to create a grid. File supported are PNG, KML and KMZ (others maybe possible however are not guaranteed to work).
Choosing you overlay
When editing an event you will be able to see a "Choose file" button that will allow you to select and upload the overlay:
Once uploaded the overlay will be displayed behind the grid:
Transparent Backgrounds
For the uploaded image to allow the map behind to be seen you will need to edit the image so that the background (or applicable parts) of the overlay are transparent.
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