When we received email from Google Search Console even we didn’t able to solve this until we make below change
To add a thumbnail for a background video in Advanced Elements in Webflow and fix ‘No Thumbnail URL provided’, you can use the following steps:
- Create a new div block and position it over the background video.
- Add an image to the div block.
- Style the image to look like a thumbnail.
- Hide the div block so that the image can’t be seen.
- Once the publishing the site, go to Google Search Console **>**Indexing > Video pages and validate the fix.