Where should I upload the files for my addon domain?

When you create an addon domain, the webroot directory is created for it. Thus, you can visit your cPanel -> Addon domains and next to your addon domain name you should be able to view its webroot folder. Then navigate to this folder with your FTP client and upload the desired files there.
Was this answer helpful?

Also Read

Adding a New FTP Account

An FTP account creates a folder on the "public_html" level of your site that allows external...

How do I use FTP?

FTP (File Transfer Protocol) is a method by which you can transfer files between computers,...

How to Check if FTP Port 21 is Blocked

Some local ISPs are blocking the default TCP port for FTP connection – 21, which may cause...

Deleting an FTP Account

Deleting an FTP account is as simple as creating the account. Deleting the account does not...

Failed to Retrieve Directory Listing

Response: 200 PORT command successful. Consider using PASV. Command: LIST Error: Connection...