if it’s for 130 maybe you need to do it on the petitioner’s account not the beneficiary’s? I don’t think you can send unsolicited evidence via mail.

is it helpful to send documents without their asking?

Thanks for sharing. I did it on the App "Inmigra USA" the community of Immigrants in the United States. inmigrausa.com There are immigration lawyers and free collaborators. Stay up to date on news of interest to the Latino community. Search Inmigrate USA. I chose the Florida community, it looks like they are starting now, so I recommend you choose Florida. Busca inmigra USA el app del inmigrante, de verdad es muy buena tambien. Thanks!!!