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A simple plugin to store Elementor Pro Form submissions
This plugin stores contact form submissions from the Elementor Pro Form Module in a handy interface on the back end of WP.
To make things even better, this plugin both notifies admin users of unread messages via a banner but also allows you to convert these contact form requests into any other post type. This means you could use a contact form to get people to submit testimonials, case studies or even front end submitted content.
It makes a simple contact form into a very versatile module indeed.
You can also export your stored contact form data to a CSV file by page submitted on or by form name (if specified in the form module).

Contact Form DB – Elementor

The plugin is great! Saved life before Elementor added native form submission save, but still :)

For anyone, who facing the Critical error issue in wp-admin panel, check the count of the saved submissions. While I have 3k+ saved submissions, WP memory limit was set to 768M and it hardly handled it.
There are 3 simple solutions:
1. Delete old submissions you don't need
2. increase WP_MEMORY_LIMIT more, like: define( 'WP_MEMORY_LIMIT', '512M' ); (add or update it in your wp-config.php)
3. in the wp-content/plugins/sb-elementor-contact-form-db/sb_elementor_contact_form_db.php file in line 564 change posts_per_page to 50 instead of -1
'posts_per_page' => 50,//- 1,

Plugin slows down the admin panel -- solution inside!

A simple plugin to store Elementor Pro Form submissions

andresitorresm

Validation Action Add-on for Elementor Forms is a custom add-on that allows you to add server-side validation actions to your Elementor 
Forms. These validations can run before any other action is processed (e.g. sending an email, collecting submissions) 
to easily ensure the user input matches validation logic chosen by you.
You can specify one or multiple validation actions for each one of your form fields based on their ID. Each validation 
will run independently from others, and if any action does not succeed, the user will get visual feedback.
Supported actions include:
<ul>
<li>Maximum length for a field</li>
<li>Minimum length for a field</li>
<li>Maximum amount of words in a field</li>
<li>Minimum amount of words in a field</li>
<li>Field must start with a given value</li>
<li>Field must end with a given value</li>
<li>Field must contain a given value</li>
<li>Content of a field must match content of another field (e.g. “Password” and “Confirm password”)</li>
<li>Content of a field must be before / after a given date</li>
<li>Content of a field must be before / after another field</li>
<li>Field must match a specific regular expression pattern (e.g. email format, phone number)</li>
</ul>
Validations set for optional fields will only run if the field is not empty.
Custom validation messages can also be configured for each action independently.

Form Validation Action Addon for Elementor

Add a custom validation action for Forms to your Elementor installation to run server-side validation for your form fields.

Contact Form DB – Elementor vs Form Validation Action Addon for Elementor