Random question - did you have your partner mail you their portion of the application and put it all together before the biometric appointment? I was wondering how that worked w/ the 28 day window from the application date for the financial documents to be valid.
It should be pretty simple - before you submit the online application, the UK partner gets their financial documents together, then overnights them to you in the US using a courier. 
Then as soon as you get them, and you are ready with all your other documents, you submit the online application. That way the financial documents will be dated just a few days before the application date.
The documents only need to be dated within 28 days of the online application date, not the biometrics appointment date.
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