Hi!
You want to attach an instance of the Microsoft Edge browser that is already open; If so, within the Attached Action properties, you should be clear about the Window Title and Secondary Index values. If you don't know the title of the window where the Microsoft Edge browser is open, you can set the Window property Title = "*" and the property Secondary index = 1. I attach reference images.
I hope this has helped you!
Cheers
------------------------------ Jhogel Ponne Senior RPA Ernst & Young America / Panamá ---------- --------------------