You will have the default memory for your File Manager cloud storage space which depends on the package you upgrade to e.g. on Complete you start with 2GB of document storage memory.
If you need more just send us a support ticket stating how much extra you need e.g. 5GB and then we will quote you an additional payment per month for that additional storage.
On acceptance we will simply adjust your monthly payment and add the extra GBs into your account!