Hi and welcome ! Your link open to your mastodon toot. You can check its result here : https://jlai.lu/post/17126676
You may want to try out with PieFed as piefed.social :)
English version below
Présentation
Cette communauté est dédiée à vos expérimentations au sein du fédiverse. Le but est de permettre de comprendre comment les interactions avec Lemmy marche.
Vous avez un post qui utilise tout le markdown de Lemmy. Ăa vous permettra de tester son rendu dans le FĂ©diverse.
Eventuellement de tester votre bot.
Gardez en tĂȘte que les posts seront rĂ©guliĂšrement supprimĂ©s.
Reset
Prochain reset planifié vers le 01/06/24 Les posts vieux d'un mois seront conservés. Décalage possible selon planning et instance.
Pour toute demande d'aide technique
Si vous rencontrez des soucis avec Lemmy, le fédiverse, merci d'utiliser : !support@jlai.lu
Nos tutos
English
This community is dedicated to your experiment across the fediverse. The goal is to try to understand how interactions between Lemmy and other fediverse softwares happened.
Please use a translator to read the full (and rather short) rules.
Posts in every language are allowed but understand that moderators will be more strict with non french content rather that dealing with the nuances of foreign languages.
Crédits
Hi and welcome ! Your link open to your mastodon toot. You can check its result here : https://jlai.lu/post/17126676
You may want to try out with PieFed as piefed.social :)
It doesn't embed on Piefed. At least it gets the video thumbnail. It's OK, Piefed. Your tile view still makes my Mbin magazine look cool.
Let's try the Lemmy 
method!
Edit: added Lemmy-style alt text
Cool, feel free to use this community to test other things about the fediverse as text formatting, posting picture, book...this is the place for that. :)
Yeah i love the large tile mode for meme community and peertube video. Very beautiful community, i subcribed to it. :)
I'll wait until they work out the problem of it sometimes falling over.
David August the musician? Or just someone with the same name
Apparently David August the actor, but I can't tell for sure if it's him in the video. His Bluesky has this post too.
I does work. I also does move fast and break dishes!
That a one month old post... What have I done with my feed settings??
Maybe it's related to language setting ?
Well, since you're here, I'll try embedding the update's original Mastodon toot and see where it works:
I don't see anything. Is it part of your comment or in a separated one?
It seems my 
doesn't work anywhere. I can't just embed a toot. I know that Markdown works for MP4 files in some places, so here's that:
I love this XD
Embedding ? You may want try Piefed too. We can embedded piefed post but i haven't tried it :)