Pretty sure all Asian people, regardless of ethnicity, aren't counted as URM. It's quite flawed, since umbrella != disaggregated data, but that's my understanding. Either way, you aren't responsible for identifying yourself as URM, the adcomms are, …
Just so you know, that's around the time that people are making their seat deposits, so while it depends on the school, April is probably out of the question.
@"Kristen R" Go into "Credentials & CAS" tab then go to "Transcript Status/Add Institutions," then on the right-hand side there's a link for "Academic Summary Report." It should give you the breakdown of what the adcom will see!
Bumping for the last question asked. Also, what happens in the case of there being a couple of gaps in our resume? Do we explain them all in one addendum?