Typically content synced from your web platform will sync the content's thumbnail images along with it. However, you have the power to customize this, or add a new thumbnail image, inside the VidApp Builder. Here's how:
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Log into the Builder
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Click Build My App
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Locate the item or collection you wish to add or update the thumbnail image on and click it
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In the right-sided tab bar that appears, click the image and either directly upload the new thumbnail image from your computer or add it via it's URL
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Save and Publish to preview to test your new app changes. Then, once your changes are ready to go live to all users click Publish to live apps