I checked the edits and since I made my post, the OP has gone back and edited the first post in this thread to add the model number, PD-FSQN-WH. So it wasn’t there when I first wrote, but it is there now, which is a good thing.
And more good news: it is still true that the Caseta fan control switch, which is indeed that model number, was very recently added to the smartthings integration. You have to be using the newest version of the integration, but it is there now. 