On my MacBook Air, there is a tripple ding/beep, and the Downloads folder opens in finder. Check the Download folder to be sure the file(s) didn’t transfer. Just in case they are getting there in stealth mode.
There is very little indication that the file successfully transferred on the iPad’s side. A brief waiting icon next to the AirDrop icon, then it was doen. Like you, the file wasn’t large. Just a screenshot.