Hi Dave, Sorry am I am so blond �� I Don't even know what IOS is , but I was writing an email, a very complicated and long medical diagnostics , so was really peeved off when it disappeared , don't relish doing it all over again.
Something like this happened to me a year ago on my Mac laptop , while I was moving a letter to a folder, all my folders disappeared and have not been found so far even tho I took it to The Apple business Centre, they never found them either. They just evaporated into thin air in front of me, so did this letter.