I bought a Bussines Seagate NAS server storage. I have set you on a network shared folder on the server under the AFP protocol. Users can get to it, creating in the "root" folder a new folder and open files. Still, if I want to create a folder in the folder created by another user, or just re-save file - I'm not allowed to. Finder wants to enter your system password and then announce "Operation could not be completed because you do not have the required permissions." On the server, while users can access a "Read only" got unchecked. At any effort to change in your own approach me to give it the same.

Can someone please help?