Should I upload just the abstract of my science research or should I also include a blurb of what I did under it?
This section didn’t exist when I applied, so what I’m saying may be off base, but what role you played and your involvement in the research is definitely going to be more important than the actual research itself (i.e. the abstract). I imagine though that you’ve covered that in your activities list or other essays though so if this is a section specifically for uploading abstracts then just put the abstract.
Upload it with a short blurb, but visibly separate the blurb.