I have added a custom option to the magento2 admin order action-dropdown in view/adminhtml/ui_component/sales_order_grid.xml. Then I created a custom method Controller/Adminhtml/Order/MassDoSomething.php, where I can do something with the selected orders in the method protected function massAction(AbstractCollection $collection); Thats works.
But is to possible to show a custom page "intemediate page" where I can show the selected orders? Or do I have to create a new admin page (like https://www.mageplaza.com/magento-2-module-development/create-admin-grid-magento-2.html) and redirect the users from the Mass Action to this page?
How can I create a custom page with the selected orders?
