Delete

when will it becomes possible to an administrative user can delete a file on the Server and Cloud Sync ?

See this help section - https://support.plex.tv/hc/en-us/articles/202606363-How-do-I-delete-something-from-my-Library-

Delete Item with a Plex App It’s possible to directly delete an item from within most Plex Apps if you’ve enabled the ability to do so. Be very careful with enabling and using this ability.