I saved my entire return but several critical forms don't save. How do I know which forms were submitted when some of them don't save?

Which forms didn't you get?  Some don't need to go.  

How to get or print a copy after filing
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-a-return-i-filed-this-year-in-turbotax-online/01/25932

Here's an alternate way to print by opening the filed return back up to print at the Print Center, where you can also get the worksheets.

You have to have your return open on the screen to get to Tax Tools and print.

Select Tax Home in the left menu.
Scroll down to Your tax returns & documents.
Select 2020, and then select Add a State (you're not actually adding a state, this just gets you back into your return).

After the return is open, click in the left menu column on TAX TOOLS, then PRINT CENTER.

Then choose Print, save, view this year's return.

The next screen should offer some options: Just my tax returns or include government worksheets (optional), or include government and TurboTax worksheets (optional.)