I take the saved PDF and drag and drop it in the grey box on the website.
I can also click on the "choose files" button and browse for the file.
I don't know if you can get this. If not let me know.
I used Power Point mix to capture a video of what it's doing.
Click on the link
click download, open with powerpoint
Click on the slide and a play button appears in the bottom cornerhttps://db.tt/WrQ7lKxHxS