Hello guys how is everyone doing today I have a quick question please, my children have been called for interview at us embassy in lagos, Nigeria and I need to update my documents that I submitted back in 2021 with nvc,which I believe is expired by now how do I send them a mail to open the NVC UPLOADING SITE for me to be able to update all the documents and 2nd question is that can I change my joint sponsorship and use different person thanks in anticipation