You may want to access your main FTP (File Transfer Protocol) account to upload and manage files on your website.
Within this article you will learn:
To set up and gain access to your main FTP account, you will have to generate a new password within plesk
After you have created your password, on this screen you will be able to see your main FTP login details including username and password.
To access your Main FTP account, use the login details that you have just created and enter them into your FTP Client (For example FileZilla)
From here you will be able to access to all your websites files.