jwenl

This plugin provides support for using oEmbed in your WordPress blog.
Rick media Example: 
[oembed:http://polldaddy.com/oembed?url=http://answers.polldaddy.com/poll/2431815/&format=xml] 
This will put the selected polldady poll on your blog
Photo example Flickr: 
[oembed:http://www.flickr.com/services/oembed/?url=http://www.flickr.com/photos/23886028@N04/3983995799/in/set-72157622398187791/] 
This will put a Flickr photo into your posting.
Video example Youtube: 
[oembed:http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=yvdbqcbRH50&format=json]

oEmbedder

This plugin provides support for using oEmbed in your Wordpress blog.

Whodunit

Jb Audras

This plugin adds a TikTok Embed Block to the Block Editor and a TikTok oEmbed support for the Classic Editor.
Copy-paste the TikTok video URL in the editor or use the dedicated Gutenberg block for more setting options.

Embed Block for TikTok

Easily embed TikTok videos in both Gutenberg and Classic Editor.

oEmbedder vs Embed Block for TikTok