You cannot scale the storage capacity of your EC2 instance once you attach an EBS volume

Explanation

You can scale EBS volumes in two ways.

1. Increase Volume size: only if it doesn’t increase above the maximum size limit. Depending on the volume selected, Amazon EBS currently supports a maximum volume size of 64 tebibytes (TiB). For example, if you provision a 5-TiB io2 Block Express volume, you can choose to increase the size of your volume until you get to 64 TiB.
2. Attach multiple volumes: to a single EC2 instance. Amazon EC2 has a one-to-many relationship with EBS volumes. You can add these additional volumes during or after EC2 instance creation to provide more storage capacity for your hosts.