I have been trying to use the new Mail Drop feature on my 6 plus. However, after I select to send the file (a zip around 350 MB) via Mail Drop and hit send the Mail app crashes out and the file and email are not sent. I am on wifi and have even tried to send the zip once it has been downloaded locally to the iCloud drive app but still no joy. I have even tried turning the iPhone off and doing a hard reset but no change. I have searched the forums but haven't seen this issue mentioned. Any suggestions??