Thanks for sharing your code and detail.
Well, I am afraid, currently, Pyramid chart is not supported for excel-to-pdf conversion feature, see the Supported Charts List table in the document:
We suggest you to use other chart types accordingly at the moment, we will look into the feature(support for pyramid charts for excel-to-pdf conversion) in future versions.
Thank you for your quick reaction and the link.
Thank you for considering Aspose.
Please try the attached latest version of Aspose.Cells. We have supported 3D Charts except 3D Bubble chart and Surface chart.
Thank You & Best Regards,