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To enable preview for files in nextcloud, you need to install “Preview Generator” from next cloud app store https://apps.nextcloud.com/apps/previewgenerator To install login to nextcloud as admin. From right drop down menu, click + Apps link. Once on Apps page, you can use the search button on right side to search for "Preview Generator" and install it. You need to install some additional software, on ubuntu/debian install it with sudo apt install libreoffice ffmpeg imagemagick ghostscript Now edit config/config.php file of your nextcloud installation, add following code 'enable_previews' => true, 'preview_libreoffice_path' => '/usr/bin/libreoffice', 'enabledPreviewProviders' => array ( 0 => 'OC\\Preview\\TXT', 1 => 'OC\\Preview\\MarkDown', 2 => 'OC\\Preview\\OpenDocument', 3 => 'OC\\Preview\\PDF', 4 => 'OC\\Preview\\MSOffice2003', 5 => 'OC\\Preview\\MSOfficeDoc', 6 => 'OC\\Preview\\PDF', 7 => 'OC\\Preview\\Image', 8 => 'OC\\Preview\\Photoshop', 9 => 'OC\\Preview\\TIFF', 10 => 'OC\\Preview\\SVG', 11 => 'OC\\Preview\\Font', 12 => 'OC\\Preview\\MP3', 13 => 'OC\\Preview\\Movie', 14 => 'OC\\Preview\\MKV', 15 => 'OC\\Preview\\MP4', 16 => 'OC\\Preview\\AVI', ), For more info on configuration, check nextcloud documenation. Generate Preview for existing files Lets generate thumbnail for existing files, for this, I enabled shell access for www-data so preview files have proper file ownership (not owned by root). chsh --shell /bin/bash www-data Now change to www-data user su - www-data Now run: (Without www-data) sudo -u www-data php /var/www/cloud.kc-linux.com/html/occ preview:generate-all -vvv or (with switching to www-data user) /usr/bin/php /var/www/nextcloud/occ preview:generate-all -vvv Autogenerate Previews for new files set a cronjob as user www-data crontab -e -u www-data */5 * * * * /usr/bin/php /var/www/nextcloud/occ preview:pre-generate > /dev/null 2>&1