If you added an attachment to your project, but they never received their confirmation email, you should ask them to check their spam folder to make sure the email didn’t end up there.

To resend a confirmation email (after 24 hours have passed, please):

Go to your project's Team tab and click "Resend verification" under the attachment's name.

If you think you may have mistyped your attachment’s email address, you’ll need to delete the attachment and then add it again.