1 question and one "bug"

The question is can you add the back erase words like is on the android version? Not only flow.

The "bug" i have iphone 5s with the last 10.3.1 and i went to general\keyboards and erase all the keyboards and add swiftkey and emoji.
The bug is when i have the phone lock and receive a message and i want to reply. When i open the reply keyboard, the main keyboard show is swiftkey but always open in the emoji option not in the normal letters to write. Only show like this in the lock/ reply screen. Of i open any app and pop the Keyboard always go to the letters option. Only in the reply is go to the emoji.
Thanks