Why does my Droplet show almost 100% disk usage even after attaching a new volume?

Adding a volume to your Droplet doesn’t increase its main disk. Instead, it adds on a second disk as a second partition. To expand the Droplet’s main disk, you need to resize the Droplet to the next plan.

If you need additional storage, you can either add a new volume to the Droplet and move some files to that volume, or configure all the logs in /var/log/ to save directly to the new volume.