Can I upload a digital product by ftp or cPanel?

I am still trying to set up my store. I am selling digital downloads of a couple of CD's. Each album is over 600MB. My hosting has my max post upload set to 64MB. My hosting plan will not allow me to change that value. They suggested that I upload my product manually in the cPanel of FTP. I have the albums stored on my Amazon S3 account.

Can I manually upload the zip files?

-Peter