How to save files into an USB pendrive?

[tflidd]

@Jobby

sudo chmod 777 /dev/sdb

I wouldn’t touch these permissions at all, these are the hardware resources and to give any user full permission to it, just don’t do it.

@Jobby

sudo chown -R www-data:www-data /path/to/usb

Yes, the mounted folder must be adjusted. The chmod is different for files and folders, that can be achieved with the find command:

sudo find /var/www/html/data -type d -exec chmod 750 {} ;
sudo find /var/www/html/data -type f -exec chmod 640 {} ;

Change ownership of Nextcloud files (root to www-data)

You can. The documentation says to do it like this: chown -R www-data:www-data nextcloud find nextcloud/ -type d -exec chmod 750 {} ; find nextcloud/ -type f -exec chmod 640 {} ; These examples use relative paths, so make sure they are correct for your system.