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Add Page Number to Existing PDF document using Aspose.PDF for .NET

I am tring to add page number to attachment file into existing pdf file .
here I am using Aspose.Pdf.Document.

we have page number to existing pdf file.

@Agade123

Thanks for contacting support.

Would you kindly share a sample PDF document with us so that we can test the scenario in our environment and address it accordingly.