As a webinar host, you can upload an image before the webinar starts. Once the webinar starts, attendees can see this image while the practice session is going on.
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Supported file types are .jpg, .png, .gif, and .svg.
This feature is available in 42.5 and later releases. This feature is not available for webinars in webcast view.
After scheduling a webinar, go to Attendee view during practice session and select Edit.
You can also select your webinar from the list under Calendar.
Drop your files into the window, or select Choose file to browse for the files.