I never get the "Do you want to send this attachment with MailDrop" dialog box, but it's working.
I ran a test with a 21.5MB attachment.
With MailDrop enabled, the message takes just a couple of seconds to send, and you get the swoosh sound almost immediately. With it disabled, the message takes about a minute to send.
Also, there is almost no activity in the Activity window when you use MailDrop, but the old way you see a "sending attachment" item in the Activity window, and then a "Caching attachments" item in the Activity window.
Whatever is going on behind the scenes is good, but I'm not a fan of Apple hiding the interface completely from the user.
I ran a test with a 21.5MB attachment.
With MailDrop enabled, the message takes just a couple of seconds to send, and you get the swoosh sound almost immediately. With it disabled, the message takes about a minute to send.
Also, there is almost no activity in the Activity window when you use MailDrop, but the old way you see a "sending attachment" item in the Activity window, and then a "Caching attachments" item in the Activity window.
Whatever is going on behind the scenes is good, but I'm not a fan of Apple hiding the interface completely from the user.