Dear Seniors and leaders, were you awaiting my next steps? 
I have been studying the TTS Util app and its info page on the F-Droid website. I have tested it. It seems to be a nice app. The voice is good for my needs.
Following the app info page and the accompanying screenshots, from the top left hand side button of the app TTS Util, I found how to set up the app to read a text file. The screenshots are already given in the app info page, so I won’t add another screenshot of the app, unless required.
But the app halts as soon as the screensaver is turned on.
Is there an option to allow the app to run in the background so that it continues to read long text files with the screensaver on, i.e., the screen automatically turned off by the system to save battery power?
I have permitted the app to use battery unrestricted, i.e., the battery optimisation was set `off`` for the app.
There seems to be another problem: the app doesn’t continually read a text file. It is designed to store the read text as a .wav file. I however want the app to read continually long a text file without creating a .wav file.
Could these problems please be solved? Any suggestion please?