I forgot to include my 1099-R. Can I still add it after I've filed?
No you have to wait. If your return rejects you can add it and resend it. But if it is Accepted you need to wait for it to be fully processed and you get the first refund. Then you can Amend.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.