Our code uses com.aspose.slides.ISlideCollection#addClone(com.aspose.slides.ISlide) to merge multiple pptx files, and then uses com.aspose.slides.Presentation#save(java.lang.String, int) to save the merged file. This log…...temporary file/stream first , then replace the destination atomically...toString(), SaveFormat.Pptx); // Replace target with the fully written...