Syncing with another computer

I'm trying to sync files between my Mac Pro and Mac Mini, both on my local network. I have a folder called "Sync to Mac Mini" on the Mac Pro that uses Hazel to sync with a folder called "Sync to Mac Pro" that is located on my Mac Mini.
(FYI I mount the Mac Mini as a volume on my Mac Pro at startup so that Hazel can find it.)
The rule running on my Mac Pro is:
If
- Any File
Then
- Sync into folder "Sync to Mac Pro"
This works when I put a file into the Mac Pro folder "Sync to Mac Mini" - the file syncs to the mac Mini. But if I copy a file into the folder located on the Mac Mini, it doesn't sync back to the Mac Pro. Is this how it is supposed to work?
(FYI I mount the Mac Mini as a volume on my Mac Pro at startup so that Hazel can find it.)
The rule running on my Mac Pro is:
If
- Any File
Then
- Sync into folder "Sync to Mac Pro"
This works when I put a file into the Mac Pro folder "Sync to Mac Mini" - the file syncs to the mac Mini. But if I copy a file into the folder located on the Mac Mini, it doesn't sync back to the Mac Pro. Is this how it is supposed to work?