８老师, 皮匠,及各位大侠:
I have been trying to extend my H1B (non-cap) for couple months so that I won't have a gap till my next H1B (capped). If my school won't be able to finish filing my extension petition before my current H1B expiration date, I plan to file H4 visa as a backup, based on my spouse's H1B.
To file H4 while I am in US, what kind of procedure and documents do I need to prepare? Also when do I need to file it before the expiration date (I don't want to file it too early to ruin the chance in case the school can still process my case quick enough for my H1B)?
A lot of thanks!