Year 2021 Schedule K-1 and K-3 Question

I bought company XYZ stock in year 2021 and sold all on the same year.  I received my Schedule K-1 from the mail.  There is an instruction enclosed with the mail saying that Schedule K-3 be available for me in August 2022.  It also says that Schedule K-3 is not required to be attached to my U.S. federal and state tax returns.  My question is do I need to file Schedule K-3 for my year 2021 tax return?