Site link preview
The link cover is displayed next to a link to your site. This image is also called a snippet or a preview.
The size of the cover depends on a social network. To make it suitable for Facebook, use a horizontal image with a size of at least 1200px. In this case, your image will be reduced to the specified size and cropped in height to 630px for Facebook.
A cover for social media will be updated in a few hours after loading, when the social media cache is updated.
Website social media cover
To upload the cover of the website (home page) for social media, go to Settings → Site settings and, at the very bottom of the page, upload an image in the Social media cover section.
This image will be shown for all page links of the website unless a specific preview is set for an individual page.

The website preview image on social media will update after a while, once the cache is refreshed by the platform. If you don't want to wait, you can manually refresh the page cache: How to clear cache in social networks and messengers
A page cover for social media
To upload a cover for a single page link:
Open a page and go to Settings.

Go to the SEO and social networks tab and upload an image.

The link preview image on social media will update after a while, once the cache is refreshed by the platform. If you don't want to wait, you can manually refresh the page cache: How to clear cache in social networks and messengers
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