The web version doesn’t seem to support the creation of new PowerPoint documents using .potx files or charts using .crtx files. Will this functionality be available in the future, or is there a recom...
Agreed. Office.js needs the equivalent of VBA/VSTO's Presentations.Open method where the supplied argument can be the path to a .potx file. This implies that developers also need the Presentations object (and most or all of its methods and properties found in VBA/VSTO).