How to Change File or Folder Permissions in Plesk
Plesk · Self-help guide
File permissions control who can read, write, or execute website files. In Plesk, go to Websites & Domains, select the domain, and open File Manager. Click the file or folder you need to adjust, then choose Change Permissions if the option is available. Only change permissions when you understand why it is needed. Incorrect permissions can stop your website working or create a security risk. Avoid setting folders or files to public write access unless support specifically advises it. If you are changing a folder, be careful with recursive changes because they affect child files and folders as well. Take a backup first when changing permissions on a live business website.