Can I submit additional documents after my online visa application is pending?

Just submitted my application online in the US, all it asked for was my employment contract and one bank statement, and identity documents, including proof of living here. I had a bunch of other documents to submit, but there was not an option to submit additional documents online. It now says pending. Is there a way I can submit other documents, or I just need to wait? Just read another post where the person was denied without explanation or a chance to supplement and I don’t want to get denied, without the chance to submit all the extra material I had. Any suggestions?