Yes, you will need to amend your return unless it is rejected for some reason. Then you will be able to add the K-1 information before you resubmit it.
Once it has been electronically filed, there is not a way to recall the submission. It is just like dropping it in the mailbox at the post office if you file by mail.
Take a look at the following TurboTax article for instructions to amend your return: How do I amend my 2020 return?
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