https://www.youtube.com/watch?v=8Qh2LI4dE_c
The Preview form for Contact Form 7.
The plugin allows using
- Preview form in admin.
- Preview form in site (front end).
Documentation 
        
            Thank you for your interest in 
Preview Form.
Minimum requirements.
- Wordpress 3.0+
- PHP 5.x.
- MySQL 5.x.
This section describes how to install the plugin and get it working.
e.g.
- Upload folder 'plugin-name' to the /wp-content/plugins/directory.
- Activate the "Preview Form" plugin through the plugins menu in WordPress.
- Go to edit form in 'Contact Form 7'.
- Click Previewtab.
If any problem occurs, please read documents Wordpress.