Nextcloud - Config.php location and Android app redirecting at login


can someone please let me know:

  1. where is the config.php file in mailinabox ?
  2. Do you know how to fix the “redirecting” error while logging normal user into Android app ?
  3. Did anyone try this :

Seems to be something at /home/user-data/owncloud/config.php, if that is what you are looking for.