How to show NEW post content in post editor?

try wp update post function:

// Update post 37 for example
  $my_post = array(
  'ID'           => 37,
  'post_title'   => 'This is the post title.',
  'post_content' => 'This is the updated content.',
  );

// Update the post into the database
  wp_update_post( $my_post );

https://codex.wordpress.org/Function_Reference/wp_update_post

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