My video thumbnail displays as a grey YouTube error thumbnail

The YouTube video you are embedding doesn't have a webP thumbnail.

You can either edit the video on YouTube and resave the thumbnails to generate new thumbnails, or you can use the Disable WebP option in the Blocks settings to display the JPG version.

Not all YouTube videos have webP images for thumbnails, so older videos need to have their thumbnails regenerated to generate a webP thumbnail.

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