Installed drupal multisite setup successfully several times, but having problem with one setup, which I think about symlink ownership.

Setup is as follows:

codebase is: www.example.com at /home/example/public_html
subdomain is: subdomain.abc.com which is a symlink to above folder named subdomain

There are two different cpanel accounts, one is _example_ and the other is _abc_

Site is working, but whenever trying to add a content using imce to upload a file, the site editors are banned from the server.

The question:
What should be the ownership of the symlink subdomain? Should it be owned by abc user or example user?