In addition to cPanel's File Manager (web-based), you can use FTP to manage files & folders.
There are plenty of FTP clients out there, and some have larger marketing budgets than others, however a reliable FTP client is what you're looking for.
We recommend FileZilla which runs on Windows, macOS, Linux and beyond, which is easily configured to talk to our infrastructure.
Once you've got an FTP client open, specify the connection details by referencing your welcome email from us.
Hostname: s##.ozcloud.net.au (EXAMPLE, check your Welcome Email)
Username: Check your welcome email
Password: Check your welcome email
Some other details are included below, though are usually set automatically:
Port: 21 (Default)
Encryption: TLS (or STARTTLS)
Passive FTP: Enabled on default port range