Why do I need a wildcard SSL certificate?

If you wish to offer SSL encrypted file transfers, you will need to purchase a wildcard SSL certificate for your primary URL. Upload the private and public keys to your storage space and contact your account manager to have SSL configured for your online storage site.

You must purchase a wildcard SSL certificate, a regular SSL certificate for a single domain is not adequate and there should be no password for the private key. The option to encrypt file transfers with SSL is not shown to your customers until you have an SSL certificate configured - even if you have SSL Encryption enabled for their plan.