My DD26 applied to both of those schools for architecture.
I can’t speak to studio art, but UT Austin outlined the additional essays/materials on their SOA website BUT they were not clear about these on the Common App, and honestly, she had to search around a bit in her portal to figure out where to upload the additional materials even after knowing she needed to submit them.
Northeastern said in their online session that the students would need to submit a personal statement (though not specific) so she had one ready about why she chose her major/why Northeastern. I agree, that upload process of file by file was cumbersome and not having the ability to see what was uploaded was a frustration for my DD as well. They certainly make it harder than it has to be!
I’ve noticed that the best information is on the college websites, doing online sessions gives really great information and that admissions offices are very timely when responding to any questions.