Nextcloud preview settings

sudo -u www-data php --define apc.enable_cli=1 /var/www/html/nextcloud/occ config:app:set --value="32 256" previewgenerator squareSizes
sudo -u www-data php --define apc.enable_cli=1 /var/www/html/nextcloud/occ config:app:set --value="256 384" previewgenerator widthSizes
sudo -u www-data php --define apc.enable_cli=1 /var/www/html/nextcloud/occ config:app:set --value="256" previewgenerator heightSizes

sudo nano /var/www/nextcloud/config/config.php

'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',

sudo -u www-data php --define apc.enable_cli=1 /var/www/html/nextcloud/occ preview:generate-all -vvv