Parrot Skycontroller 3 Tablet Mount is what it's for. You can see it on the Skydio webpage listed for the Pro kit. I bought one for $50 and will just fit an iPad Pro 11 very snug if you slide it sideways
Ahhh, thanks for finding that out -- I was curious too... Was using it to keep FAA registration papers, test papers, etc, in it which works for that too.