krsbusiness.roxa ... by way of clarification, Adobe Sign has a monthly subscription for $14.99, and you can cancel any time.  Client does not have to download anything, and no cost to them.  Adobe sign sends the document to them, they open & sign on their phone, tablet, laptop, or desktop, and it is transmitted back to you, no cost to client.

I do support your comment that Profile PDF files cannot be attached to Gmail.