Resize Image Uploaded with Gravity Forms

add_action("gform_after_submission_3", "gf_resize_images", 10, 2);
function gf_resize_images($entry, $form) {
    //replace 14 with field ID of upload field
    $url = $entry[14];
    $parsed_url = parse_url($url);
    $path = $_SERVER["DOCUMENT_ROOT"] . $parsed_url["path"];
    $image = wp_get_image_editor($path);
    if ( !is_wp_error($image) ) {
        //replace 640,480 with desired dimensions. false indicates not to crop image.
        $result = $image->resize(640, 480, false);
        $result = $image->save($path);
    }
}

source: https://ithoughtyoucouldusethis.com/resize-image-uploaded-through-gravity-forms/