I am at the stage where I submit my husband's civil documents and visa applications the $230 visa processing fee has already been paid. Can I fill out the ds-260 online and then submit the civil documents by mail? My husband currently is abroad in Germany.
NVC provides you with very detailed instructions. You should follow those to the letter.
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It imperative to follow the instructions from NVC to the letter.
You must read the detailed instructions very carefully. They include information about whether documents must be submitted by mail or email.