Trigger workflow on multiple assets after selecting multi resource support checkbox on workflow model properties

Although, I have selected multiple assets from asset console, and run a custom workflow on it, it is creating notification for all the assets, while multi resource support checkbox is selected on workflow, it should create a package and run that workflow on it. and It should create only one notification for package payload, why it is not working?

Note- I have enabled multi resource support checkbox and synced my workflow as well.