I'm trying to send estimates and invoices to my customers via text message. I see that the way to do that is to fill out the estimate/invoice, then click the 'share link' option and copy the link to a text message. However, when I do that, I don't get a link, and I get a message saying 'Please provide customer email'. I have almost none of my customers' email addresses and do not wish to send an email. It would be unusual and needlessly cumbersome in my industry to insist on all of my customers giving me an email address to receive an estimate. How do I send a link without having their email?