Once you have filed an extension you do not need to file another one. You can however make an additional payment.
An extension extends your time to file, not your time to pay, so if you know additional tax is going to be required, it is best to pay that now to avoid additional interest.
I'm confused about the amendment question though. If you haven't already filed, hence the need for an extension, why are you wanting to amend? You will simply add the new documents to your unfiled return prior to filing.
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