I have app version 18.0. About 20 minutes ago I composed an email to a new contact (responding to a letter he sent me). The email was ready to be sent but before I did so I passed the phone across to my wife to read it. She passed the phone back and the message had disappeared from the screen. I have two email accounts that are Unified. The missing email was written with the main account so I checked in all those folders, including Sent, Junk, Spam, etc. I tried searching for the recipient's email address and tried Search everywhere. I also checked on TB for desktop on my laptop. I thought that composed messages were automatically saved. I have seen this during composition when opening a different app to check something and a message appears at the bottom of the screen "Message saved as draft" or similar. I'm trying think what is different this time. Can you offer any suggestion?

Richard