'Referencing local image in PlantUML salt wireframe

I'm trying to include a local image into my PlantUML salt wireframe for my GUI documentation. The PlantUMl reference page only shows how top include a http link. How to do this?

I tried the following, but I'm getting "Cannot decode" in the output.

@startsalt
scale 2
{

title Test Page
{S

{^"Figure"
<img:file://./pie-chart.png>
<img:file://./pie-chart.png>
<img:.\pie-chart.png>
}
..

}

}
@endsalt


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