Permissions after syncing

I have two DS1522+ in different locations. A is used to store movies and replicates to B. B is at a location where I want to still watch the media with Plex locally. However, each time the shared folder syncs, Plex loses the ability to see the media until I go into the Control panel and add the read permission again.

Is there a way to either avoid this problem or automate the permission fixing action with task manager or something?