Unable to switch to the pop up window while uploading folder to Sharepoint

My task is to upload a folder to Sharepoint which has multiple folders with files residing in it. While uploading, a pop window appears and asks the user confirmation. My selector does not able to recognise the pop window. instead it was selecting the background selectors. I tried using attach browser, attach window but still does not work.

Can you try switching to modern design and try to indicate that?

It was already enabled. Not working…

classic activities also you have tried