Unable to Insert Action in Existing Task List Workflow

I am not able to insert a new action into an existing task list when I want to edit it. I am trying to add a timer action after a condition before a send email action and it will not let me add it. Link to video https://app.screencast.com/vgda9f6Or7l14 it will add the action but wont let me insert it in the middle of the existing flow of tasks