Small question, since the developer docs are not available on mobile devices: When the flatfile.io homepage keeps referring to "XLS" docs, is it actually tryin

Small question, since the developer docs are not available on mobile devices: When the flatfile.io homepage keeps referring to "XLS" docs, is it actually trying to say they will import modern Excel files ("XLSX") or does it literally mean you would have to ask users to re-save their spreadsheets into the ancient format?