Where you upload the files pertaining to Primary Domain, as I couldn’t find any folder name with Primary Domain?

In cPanel, default location pertaining to your Primary Domain is home/username /public_html”. Any files associated with your Primary Domain, should be uploaded under “public_html” folder.

When you add more domains, you can find the folder name with those Add-On domains under “public_html” locatin.

Ex: If you have added a new domain “example1.com” then the location to upload files pertaining to that domain would be “home/username /public_html/example1.com”