“Linking” is just the term for what you have already done with the other items. I don’t know if you did it via text files or from the channel page of your quadmote thing or the create thing from equipment feature of the semantic model.
As for the rule you have already shown a screenshot of a UI rule with several triggers (the "When"s that you build for a rule) in your original post. Many of them say When X changed but the fourth one down says When X was updated. It is that kind of trigger that you want for your rule. The nice thing is, if you create an item linked to the general scene_number channel of the quadmote thing, then you only need 1 trigger for the rule, not all of them.