This tutorial shows you how to handle permission issues within ZOO.
Permissions are inherited from the parent folder. If you set the specific ZOO folder (e.g.
/media/zoo) and all sub files/folders to the correct permission but the whole Joomla media folder has lower permissions it will not work. Best way is to alter the permissions of the top level folder. Sometimes Joomlas root directory has too low permissions and you wonder why it is not working...
777 permissions. If your webserver has problems with the
CHMOD 755, you can also try
775 and lastly
777 in this order.
755. Make sure the Recurse into subdirectories option is checked. Then hit the OK button.
Tip: After applying new permissions some FTP clients require the file view to be refreshed. Otherwise the old permissions will continue to show...
Using a FTP client may also change file ownership to the FTP user of the files/directories you changed the permissions on. This can cause problems on some webservers. To avoid this you can use a Joomla component like eXtplorer to update the permission through the Joomla administration.