An array containing dragged file types that are readable.
- macOS 10.12+
A view must register what types it accepts via
register. Use that class method to get the file promise drag types that
NSFile can accept, in order to register a view to accept promised files.
NSFile can accept file promises from both the item-based
NSFile and the non-item based API. If you don’t register all these drag types, you might not be notified about some file promise drags. Register using the following code: