When I convert ppt to pptm, Aspose.Slides losts “HeadingPairs” and “TitlesOfParts” tags from the docProps\app.xml. I get same issue when I convert xls to xlsm using Aspose.Cells. But these tags are created correctly when I convert doc to docm using Aspose.Words.
Same conversion with MS PowerPoint and MS Excel doesn’t lose these tags. Issue can be reproduced on any ppt and xls files. I use Aspose.Slides v. 19.2 and Aspose.Cells v. 19.2.