Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....section2 will start pres -> Save ( u "pres-sections.pptx" , SaveFormat...ReorderSectionWithSl ( section2 , 0 ); pres -> Save ( u "pres-sections-moved.pptx"...