you must send in forms w-2 with your pa tax return

Hi,

I'm living in PA, and for the first 7 months of 2020, I worked in PA, but starting from November I got a job in Delaware, but due to the covid, I worked from home.

So when I file the state tax, under Any Special Pennsylvania W-2 Situations section, I choose "you earned income in another state" and "your employer withheld income tax for another state".

Then it's saying Prepare W-2 Additional Information Statement, you must send in forms w-2 with your pa tax return. 

What statement/forms I need to provide? 

Do I get refund for the withholding tax in another state?

Any help is appreciated!