You won't file an amended return, because with an extension you aren't filing the return yet. 1040 X amended form is for returns that have been filed.
Login to your account then search for extension, then follow the instructions. You will still need to pay the taxes due (if any) by the April 18, 2016 due date.
When you receive your K-1, log back into your account to add the K- 1 and file your return as usual.
https://ttlc.intuit.com/replies/3301811
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