Owncloud External Storage (local) - Created file permission

Hello everyone.

My Case:
I’m using External Storage in OwnCloud X with php config enabled “Local” storage option.
I have access to that resource (for example /home/user/share) from OwnCloud and as Samba (for Windows machines - locally)
Problem:
When I create (txt for example) file in OwnCloud (by web browser) it successfully save it on disk but with 644 permission (and www-data as owner).
In result, when I’m accessing this file from Samba share (windows machine for example) I can only read this file by group/others and I need to have write permissions too.
Question:
Is it possible to setup OwnCloud to save all new files with 666 permission (on that “local external share”), to be able to edit files created in OwnCloud from Windows by SMB Share?

Simillar problem occure when I use SMB/CIFS option for that External Storage.
I’m using the same ‘user1’ credentials to connect to my Linux server from windows and to connect external storage in owncloud.
I can create file in shared location from windows, but can’t even read it, when I’m accessing this file (created in windows) from OwnCloud i can read and write to it.