Rename Attached files

this hook to make it rename files uploaded via form to the value of full name field which has “ID =17”. the hook works but it is giving the file the value of full name field from the previous entry instead of using the current.
please help!

 function add_upload_prefilter() {
$full_name_global = FrmProEntriesController::get_field_value_shortcode(array('field_id' => 17));
add_filter('wp_handle_upload_prefilter', function($file) use ($full_name_global) {
static $counter = 1;   
$original_name = $file['name'];
    $extension = pathinfo($original_name, PATHINFO_EXTENSION);
    $formatted_counter = str_pad($counter, 2, '0', STR_PAD_LEFT);
    $new_filename = $full_name_global . '_' . $formatted_counter . '.' . $extension;
    $file['name'] = $new_filename;
    $counter++;
    return $file;
});
}
add_action('wp_ajax_nopriv_frm_submit_dropzone', 'add_upload_prefilter', 1);
add_action('wp_ajax_frm_submit_dropzone', 'add_upload_prefilter', 1);