Tell us what you are trying to do? Try to insert a toolset view (slide) between paragraph. To be exact after 3rd paragraph.
Is there any documentation that you are following? I couldn't find any.
Is there a similar example that we can see? I uploaded a mockup page for the single post page.
What is the link to your site? Still in the idea phase, I want to make sure it's possible first before I give the design idea to a client.
My rough idea is to do it with 3 diff views.
view #1 : limit the content for the first 3 paragraph. Within (<p></p>)
view #2 : slide / feature image / or anything
view #3 : content start from paragraph 4
I don't see any way you can do this automatically very easily.
Because the content of a page—what's saved as post_content in wp_posts—is handled in its entirety.
I can output the content of whatever page wherever I like using Views shortcodes, but there's no ready way to output just the first 3 paragraphs of the content, for example.
You can sort of do that with the post excerpt, though that's based on character count or word count, but there's no equivalent to show the rest of the content excluding the initial excerpt.
A View doesn't help, because a View queries the database for posts and iterates over them. So if you were displaying a list of posts, you could insert something after the 3rd post, or after every 3rd post, yes, you can do that.
For your request you would need to write a custom shortcode to output the post content which used regular expressions to extract either the first 3 paragraphs or everything after the first 3 paragraphs, as required.
That's custom work that I can't do for you, I'm afraid.