To upload a website from your computer to the Plesk server by using File Manager, follow these steps:
Login to your control panel.
Click on Websites & Domains.
Click on ‘File Manager’.
Click on ‘Upload'
Select the file from your computer.
If you want to edit pages of your website, you can do it in File Manager. It provides an HTML editor that allows visual editing of HTML pages (without needing to manually type HTML tags). To edit a file in the HTML editor, place the mouse pointer over the file, open the file's context menu, and select Edit in HTML Editor.
You can also edit files in the File Manager's text editor. To open a file in the text editor, open the file's context menu, and select Edit in Text Editor.