Getting Hazel to act on external SSD

I'm struggling to get Hazel to act directly on an external SSD to auto rename files as I import them into new folders.
Maybe I'm looking in the wrong place for instructions in the manual?
I want them to have the name as per: number and date, is this possible? Thanks.

Can you provide more details?

OK: so I use an external SSD to import photos and videos to, when doing so I create a new folder for that shoot. As the files are imported I would like their names simply changed to number and folder name ( the folder name will be the location).

Are you able to throw any light on this, please?