A Boolean that indicates whether the panel’s browser allows the user to open multiple files (and directories) at a time.
- macOS 10.0+
When the value of this property is
YES, the panel’s browser allows multiple selection.
If multiple files or directories are allowed, then the
filename method—inherited from
NSSave—returns a non-
nil value only if one and only one file is selected. By contrast,
URLs property always returns the URLs of the selected files, even if only one file is selected.