You can add a cover for your presentation in the „Story Settings” section. By default, the cover of your presentation is its first slide.
Click the settings icon (the „sprocket” icon) in the Editor in the upper right corner
Find the „Story Cover” below „Story Description”
Click the „Add Media” button
Clicking will take you to the „Media Library,” where you can add a new file from your computer, either as an external asset or by selecting from a stock gallery provided for you
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