You can upload files to your domain via DH panel. DH panel --> Domains --> Manage Domains --> WebFTP
Your files should go to /home/youruser/yourdomain directory.
Note: if you log in via FTP, you will go to /home/youruser directory. You will see three directories "Maildir", "yourdomain.com", "Logs". You should upload files INSIDE "yourdomain.com" directory.
If you log in via WebFTP, you will go to /home/youruser/yourdomain.com directory.
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