I'm working with UICollectionView and Drag/Drop Delegates. I need to drop a data source's item into an empty section. I've learned about that and I found out that it's a long-ongoing trouble (e.g. https://developer.apple.com/forums/thread/114010). But I noticed potential solution in iOS Messages on iOS 15:
I tried to do similar placeholder but I don't which class it is. Any ideas? Thanks in advance.