For the attached file
Aspose.Slides.Presentation.GetThumbnails failed with Object reference not set to an instance of an object when running on Linux with Aspose.Slides.NET 22.4.0 as a .NET Core 3.1 application.
test.zip (44.2 KB)
I have manually edited the WMF to remove proprietary data. The problem already occurred with the original image.