Update SharePoint Site Logo and Thumbnail with PowerShell In SharePoint Online sites, the distinction between the Site Logo and Site Thumbnail is crucial. The site logo appears in the site header, while the site thumbnail is used in search results, site cards, file copying/moving, and other areas. Both site logo and thumbnail are part of SharePoint branding. This post covers how to update the site logo and thumbnail across multiple SharePoint sites within a hub using PowerShell.