Drag and Drop From Built-in Dictionary (iPad)

I’ve stumbled across something cool, if only I could get it to work all the time. I maintain my own dictionary in Scrivener, mostly of very difficult words (for me, anyway). When I select a word and choose “Look Up” I can drag the definition into Scrivener, and on rare occasion I get the green plus sign on the right end. Then I can drop the copied definition next to my word. It works 100% of the time if I paste to another application that I’ve split-screened. But it sure would be easier to drop it within Scrivener IOS. I’ve kind of wondered if even the Scrivener developers know about this “feature.” It seems to be a trick to have it positioned just right for it to work. Does anyone know a definitive way of making this work?