Clicking the signature button in the header will open the signature dialog immediately. Users can also choose to save the signature and preview it before being drawn on the document.
![new signature modal](/static/img/signature/pdfjs-express-signature.gif)
If there are any saved signatures, clicking the signature button will open an overlay in which signatures can be chosen and applied directly.
![new signature overlay](/static/img/signature/pdfjs-express-saved-signature.gif)