I have found a work around.
When you open a file type a bunch of carriage returns: 10 to 20 depending on the
font size you are using. You need to get a scroll bar on the right side of the screen.
Next tap at the beginning of the first line to move the text insertion point back to the
beginning of the file and start writing.
As the screen fills up, you can use the scroll bar to clear more space on the screen.
All your files will have a bunch of blank lines at the end, but it makes it pretty easy to
input text.