In the Logging list I’ve got some error messages about the file Wrapper.php
1°) Missing argument 2 for OC\Files\Storage\Wrapper\Wrapper::file_put_contents(), called in /var/www/nextcloud/lib/private/Files/View.php on line 1124 and defined at /var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php#250
2°) Undefined variable: data at /var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php#251