Hi Manish Kumar Bohra,

you can use the widget, widget="many2many_kanban" for that.
but you have some extra steps in the attachment adding stage.

1. Add the attachment.

2. Create or Select one item from the wizard(ir.attachment model)

3. If you are creating, you have to give name, file in the wizard.

4. Then you will get this type of form view.

Note: In my knowledge, you can't delete an attachment you are uploaded. but you can change the name and file.

Hope this will help you.

Thank you.