In this post, why some image or thumbnail not showing up ?

https://lemmy.world/post/29215031

It opened here. But when l putting it in the URL section of the main post, it’s not working then.

This is the link of a Bollywood song. Is it opening ?

https://www.youtube.com/watch?v=R1Z4PXNxUhk

True. But when l’m putting the URL of a particular video on YouTube, that particular video is not getting fetched.

Where ?

Do you see this ? I just want to decorate it and make it attractive so that I can circulate it on various social media apps.

You need to download it ?