To copy files in File Manager, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Websites & Domains.
3 – Click File Manager under the domain you want to manage it.
4 – Open the folder where the file exists that you want to copy.
5 – Select the files or folders you want to copy, and then click Copy from toolbar.
6 – Navigate to the directory where you want to put a copy of the file.
7 – Click OK.