> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.oneupapp.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Why does my tweet not show a link preview?

All tweets scheduled in OneUp will publish exactly as if they were published directly on Twitter.

OneUp will try to display link post’s previews inside of the tweets preview. Typically if the link’s website has Twitter Cards enabled a preview should display. To verify if the site you are linking to has a Twitter Card, and to see what it will look like, enter the link into [Twitter’s Card validator.](https://cards-dev.twitter.com/validator)

Learn more about [Twitter Cards](https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/abouts-cards), and how to add them to your website.