This question came about when a student was wondering about enforcing a file screen for one type of file, but auditing for another type. I first tested this by attempting to apply two separate file screens to the same folder. I received the following error:
Can't create file screen in the given path as a file screen already exists for that path.
I then created a child folder inside the original one and then apply a different file screen to it. In this configuration, I was able to get FSRM to block one type of file, and audit the other. Set up your share on the child folder. This one will have both screens being applied to it and is the one that we want users to store their data in.