The template library students have been using for years, now with an AI generator in front of it. Describe the presentation and it produces one on a designed template, which you then open in Google Slides or PowerPoint and finish yourself. Because the output is a normal file built on a real template, it sidesteps the export problem entirely, and the free tier covers coursework comfortably.
The AI writing is basic and the results feel templated, because they are, so it is the wrong tool for a deck that has to stand out or carry a serious argument. For a well-presented assignment or an internal update due tomorrow, it is the fastest route to something that looks considered.