Once your original return is completely processed and money settled, then you can do the amended return and add the k-1. Estates can do extensions until mid September so this isn't surprising. You may even want to wait a little extra- in case they do a corrected form.
You should not need to mail the k-1 unless it has tax paid. The IRS has its own copy.
Save a copy of the return already filed before making any changes.
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