Digital ocean Block Storage

Hi I have a client that runs a multisite installation. The size of the site has exceeded the droplet’s available volume so I had to add 20 gb block storage. My question is that how can i create a symbolic link between the folder of some large subsites located at /var/www/example.com/htdocs/wp-content/uploads/sites to the block storage

Check out the documentation from the digital ocean which could guide you in using their block storage.