Source code for https://formidable-masterminds.com/taming-e2pdf-saves/

robl-source-code.php

<?php

add_action('frm_after_create_entry', 'generate_form_e2pdf_for_summary', 30, 2);
add_action('frm_after_update_entry', 'generate_form_e2pdf_for_summary', 10, 2);
function generate_form_e2pdf_for_summary($entry_id, $form_id) {

	global $wpdb;

	$formIdList = array(1,2,3); // use your own list of form ids for which you use e2pdf

	if (in_array($form_id, $formIdList)) {
		// find the matching e2pdf form template
   		$sql = "SELECT ID FROM {$wpdb->prefix}e2pdf_templates WHERE item = $form_id";
		$templateId = $wpdb->get_var($sql);
		$fileName = “”; // set your file name
		$dirName = “”; // set your directory name, e.g., wp-content/uploads/xxx
	echo do_shortcode('[e2pdf-save id="' . $templateId . '" name="' . $fileName . '" dataset="' . $entry_id . '" dir="' . $dirName . '" create_dir="true" overwrite="true" apply="true" filter="true"]'); 
	}
}