I tried to duplicate what you have (which works in your example) but it broke it badly, so I left it. One day all the Fediverse will be universal in how it works.
Some software clients parsing the Fediverse protocol treat some special markdowns differently. It’s gotten better as new versions are updated to recognize more, but it’s still a thing.
As a general FYI, you can make a clickable YouTube thumbail like this
Just replace the videoID in the thumbnail and URL.
I tried to duplicate what you have (which works in your example) but it broke it badly, so I left it. One day all the Fediverse will be universal in how it works.
This is about Markdown, not Fediverse.
Some software clients parsing the Fediverse protocol treat some special markdowns differently. It’s gotten better as new versions are updated to recognize more, but it’s still a thing.