Keyboard not working. If the keyboard does not appear or is not working as intended, follow these steps: Restart your device by turning it off and then back on. If restarting your phone does not resolve the issue, begin uninstalling third party applications. These may be causing your keyboard from working.
There is a video tutorial here: Type, edit and format with your voice in Docs—no keyboard needed. You will also find that Google may not automatically start a sentence with a capital letter, so you either have to select the first word and tell Google to ‘capitalise’ it, or change the letter manually with your keyboard.