1) Create one folder as the webdav shared folder, check the share with IOS devices option in server.app and grant read & write permission to our group user.
2) All users connect to the webdav shared folder using the link http://myservername/webdav/shared_folder_name and succeeded.
3) User succeeded to read, copy file/folder from shared folder to local and copy new file/folder the shared folder.
4) User failed to rename the file/folder and save any changed in shared folder.
Does anyone have the same problem? Is there any special setting for webdav sharing?