All Pressable plans offer a fixed disk space for the entire plan, shared across all sites. Those default limits can be reviewed on our pricing page. If more storage is required it can be purchased by the GB and added to your plan. For assistance with that please reach out to our billing team.
If adding additional storage to your account please be aware that there is a maximum allowed storage size of 200 GB for a single site. This is a system-level cap that cannot be exceeded.