That’s why I always use the web interface instead, you’re able to edit text files.
There is already a fix for the encoding issue: https://github.com/nextcloud/android/pull/1333
A simple Text Editor would be nice that is true. Other than that for ta´king notes I’s suggest using one of the open source notes taking apps that have been written for Nextcloud for the time being since I can’t say when someone will find the time to work on this. Anyone is always welcome to jump the dev train and provide a Pull Request since I’s day “simple text editing” would be something we all would like to see added to the app.
Thanks @nextclouduser,
let’s hope someone will find the time in a not too distant future to take care of this