Powerpoint 365+stylus

In the current version of PowerPoint used on a Surface, you can use a stylus to write on a slide in edit mode, save the document and the written comments remain in the page.

In the current version of PowerPoint used on the iPad, you can only use the stylus in slideshow mode, but not in slide edit mode. Therefore, you comments made with the stylus are not able to be saved.

Suggestions appreciated