In Modern attach window and open browser are combined into use application/browser
To see classic activites go to activities → filter icon → Select show classic , then you will see attach window as well
You might be using Modern Activities, hence you are able to see Use Application/Browser.
IF you need the Attach Window Activity, you would have to click on filter button in activities and click on Classic
Check for Classic and you’ll be able to see it.
Hi @Nishita_Jain - This is because, your project has set to Modern Design . Attach Browser comes under Classis Activities. To get this, enable classic option in the filter
Thank you for the solution.It worked .