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I have been unable to successfully save any Presentation to a memorystream without being prompted to repair the document when opening in Powerpoint 2019. Please refer to the below code snippet to see if you can reproduce your own side.


        Using p As Syncfusion.Presentation.IPresentation = Presentation.Create

            Using ms As New System.IO.MemoryStream


                 ms.Position = 0

                Using fs As New System.IO.FileStream("E:\testiems.pptx", System.IO.FileMode.Create)

                    fs.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length)

                End Using

            End Using

        End Using