Some things you need to know:
* ownCloud provides an “External Storage Support” feature that supports access to files “external” to the ownCloud “internal” filesystem. This feature must be "enabled" by the ownCloud "admin" user via Settings => Admin.
* File ownership '''after''' upload (using ownCloud provided services): apache:apache
* File permissions '''after''' upload (using ownCloud provided services): 664 (rw-:rw-:r--)