Reporting a bequest on a form 3520. I uploaded it to documents however TurboTax says the form won’t be included in my tax return- how do I add it so it IS included?

I’d like to attach a form 3520 to my 2024 tax return. I have uploaded a completed pdf version of the file to the documents associated with my 2024 tax return. However, a TurboTax message that popped up said the document won’t be attached to/included with my return. How can I attach it to my return for efiling?