editor=”true” attribute not working

I’m working on setting up a form using Flexi through which members can submit a video and brief bio/description to be included in a member “gallery” page. I need the bio/description field to be a rich editor (WYSIWYG) – the documentation states that you can utilize the editor=”true” attribute in an article field to make it a rich text box instead of a standard textarea, but nothing changes when I add the attribute to the article field in the form shortcode. Is that attribute still supported?