Organizers can upload slides at any time.
Click the Upload Slides button on the Meeting Summary page. Presenters can upload slides whenever they can enter a meeting. If you are a presenter, open the Conference Center Console, and then click the Upload Slides button. You use the Upload Slides page to upload slides, but if you have a problem uploading slides, click the Alternate Uploader button and try the page that appears. It displays a progress bar during conversion and uploading.