All Photos that imported in Lightroom CC Desktop, Mobile and Web are synced to the Cloud (dependant on internet connection). Any photos deleted from Lightroom CC on from one client will also delete from the Cloud, and across all other clients.
Or do you mean syncing from Lightroom Classic or importing from Apple's Camera Roll?
i should probably start at the beginning! I have filled the hard drive of my laptop. i have several thousand photos, of which only about 8000 are in collections that i want to keep accessible via the ap and able to share. So what im trying to find is a way to create a list of photos that are in and out of collections so i can copy them off?