A directory accessible by everybody

I'm putting a file on operating system into the data directory and it appears within the WebGUI of Owncloud (I'm using Webdav)
However, I have to put a same file in each account (one by user) else the file isn't seen by everybody. It's boring.
Is it possible to create a directory accessible by all users ?
If so, how can I do ?

Server configuration
Server configuration
Operating system: Red Hat 7.1
Web server: Apache 2.4.6
Database: MySQL 5.6.27b
PHP version: PHP 5.6.5b
davfs2 : davfs2-1.4.7-6.el7.x86_64.rpm
ownCloud version (see ownCloud admin page): 9.0.3
Updated from an older ownCloud or fresh install: Fresh install

You can use the external storage app with the local storage option like described here:

and make that available for all users.

Create a folder, share with all users by name or group.

For example, create -> Folder -> "Folder_to_Share". Select share icon. In the text box type "Users" (a search prompt will suggest Users (group)), save and the folder will be shared with all members of the "Users" group.

Thank you very much Amgine, you're right !