This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
In amCharts 4 each series can have its own data (set via own data property). Such data will not be exported using exporting functionality. This demo shows how we can use export's data adapter to combine local data from multiple series in export.
See the Pen amCharts 4: Combining local data from multiple series for export by amCharts team (@amcharts) on CodePen.24419