I have received an answer from my Support Ticket. The tutorial needs updating with at least two steps to be done prior to the tutorial's steps.
1) Shutdown the droplet
sudo shutdown -h now
2) Refresh the Droplet page in order to refresh the Volume page, then disconnect the Volume from the Droplet using the pulldown (which will then no longer be grey).
3) Follow the tutorial at:
0) During this process I got a corrupted filesystem – I do not know the fault as it could have been something that I did. But I suggest that you backup your Volume offsite as a first step.
It all went smooth until the lsblk step, when I didn't get a filetype or UUID back from the system. Later, at the e2fsck step I got the following error. I report this here in case it happens to others so we can get a history to the Support team:
sudo e2fsck -f /dev/disk/by-id/scsi-0DOVolumemysfo2volumename-part1
Bad magic number in super-block while trying to open /dev/disk/by-id/scsi-0DOVolumedownloads1-part1
Couldn't find valid filesystem superblock.
By attaching a DigitalOcean Block Storage volume to a Droplet, you can easily increase your server's capacity as your requirements change. While it's possible to attach multiple volumes to a single Droplet to expand the available capacity of your server, it's also possible to expand the size of an existing volume. This process involves increasing the size of the volume in your DigitalOcean account, followed by some operations on the server itself to expand any partitions and filesystems.