Delete a file uploaded in multiUploadField

I Want to delete a file uploaded in multiUploadField. I managed to display the upload map on a grid but im trying to remove a selected file. It wont work because its an unmodifable map. Is there a way to achieve this?

It will be easier to suggest something if you provide some code.

Usually grids / tables display data by being connected to the collection container. To modify data in the collection container one calls getMutableItems() method.