Thanks for your posting and using Aspose.Cells for GridWeb.
Please share with us your sample project. Probably, this feature is not supported. We will execute your project at our end and log this issue in our database for investigation. We will look into it and fix it or support it if feasible. Thanks for your cooperation in this regard and have a good day,
We have tested this issue with the attached sample project and found, import of gridview is working fine. However, for nested gridview, we need your sample project. Please download our provided sample project and either add your own aspx page or modify the existing one and re-submit it to us. We will then look into it and log this issue in our database for product team consideration and implementation in later releases.
I have also attached the screenshot showing the output of the sample project when it is executed and the output excel file generated by it for your reference.
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