[phpvirtualbox] permission for shared folder

Hello,

I have a problem with phpvirtualbox and the shared folders.
I installed debian (+pyload and owncloud) in a VM. Everthing works fine, but I can´t read/write into the shared folders..

1. pyload can´t write into the folder (https://github.com/pyload/pyload/issues/2462)
2. Owncloud can´t open the shared folder, too.

I think thats a generally problem

I added the "owncloud-user" in /etc/php5/fpm/pool.d/owncloud.conf (e.g. www-data) and root (user with root privileges) to vboxsf group.
It´s possible to navigate to the folder /media/sf_examplefolder and open the subfolder when I set chmod 775 or 777, but 770 doesn´t work

Solved!

I´m using NFS to share the folders and it works..