While I expect it to change, perhaps frequently, for now this is the trick on embedding X/Twitter posts/videos effectively:
Click the three dots (‘hamburger menu’) upper right of the post, choose ‘embed post’
then either ‘embed video’ or ‘embed post’, copy code:
The Falcons picking up free agents pic.twitter.com/cY3nK88Srx
— The Brohioan (@TheBrohioan) March 9, 2026