Add cookie support to Elementor Pro
This method has been officially deprecated and archive only. Please use Native Elementor Form Support
In case Elementor Pro doesn't capture UTMs as it is supposed to. You can try this reliable method that allows Elementor Pro to grab the UTMs from COOKIES.
Install the cookies module
First of all, download the cookies.php file from the attachment (left sidebar) and upload it to wp-content/plugins/elementor-pro/modules/dynamic-tags/tags
Acitvate cookies module
Go and edit the wp-content/plugins/elementor-pro/modules/dynamic-tags/module.php:52
and add Cookies in the get_tag_classes_names function's array
Set your field to read the value from Cookies.
Go to your form you'd like to edit, select Default Value as "Cookies" under "Advanced". And then enter the the parameter name in the text field as shown below.
You can use any parameter name listed here Native WP Shortcodes