In the card validator all is shown and the website is whitelisted, but only show plain text Example url http://www.documentaryarea.com/player.php?title=Surprising%20Beginnings
I just Tweeted that link and the summary card shows up as expected. Note that the card does not show in the web composer, only in the final Tweet.
Thanks for the explanation, I didn’t see this advice before in any place. Not to show all in the web composer can be a source of confusion for every web devloper.
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