Hello, I am sharing movies with friends on my plex server. I do this by adding their accounts to my friends group. The question is whether such a user is only able to play / download files. Or for any access to the server configuration (including file deletion if it is enabled in the library settings)?
That’s correct.
There’s a relatively long-standing feature suggestion to allow users within your home to delete stuff or act as admin too – however that hasn’t gotten much attention from the community yet.