Aspose Slides for .Net 16.12.0.0
Once saved it's not possible to edit the chart data in the attached document.
Example code :
static void Main(string[] args)
{
var doc = new Aspose.Slides.Presentation("C:\\temp\\Demo1.pptx");
doc.Save("C:\\temp\\Demo1Saved.pptx", Aspose.Slides.Export.SaveFormat.Pptx);
}
Open Demo1.pptx with Powerpoint 2013. Click on the chart, then menu Chart Tools->Edit Data
Editing data is ok
Do the same with Demo1Saved.pptx : the Edit Data button does not work.