How can YouTube creators customize Shorts thumbnails?

YouTube now allows creators to customize and edit their Shorts thumbnails even after the content has been uploaded. The process involves selecting a frame and enhancing it by adding text or applying filters to make thumbnails more engaging. To create custom Shorts thumbnails, creators need to navigate to the Details page of their new or existing Short and tap the pencil icon. This feature gives creators more control over how their Shorts appear in feeds and search results.