You can always upload new documents, but it does say that your file will only be boarded once. However, the sat/act might be a set scale to points ratio, so they might not need to be reviewed, and as such they would just be reflected on your new whole person score...
I think someone has the answer to this. The PMS at my schools of intent all told me that I could make changes up until february and they would go into my consideration. Just a note, after sending cadet comand my november sat scores, it did show up on the system in early january. (I was boarded in october) I initially just sent a screenshot of my scores, but then sent a proper file.
From my experience yes, but I may just be misunderstanding part lf the system.