Arts Supplement Material, Specifically Columbia University

My son has submitted supplement arts material to all the colleges he’s applying to. One thing we noticed is that some colleges don’t necessarily make it easy to supply them with such supplemental materials, almost as if they’re discouraging such submission. Of these colleges, Columbia seems to stand way out. They provide “instructions” on submitting the supplemental materials, BUT they don’t provide the link to the Slideroom where my son can upload his music material. We looked and searched everywhere and we just can’t find a means to submitting the materials. We’re about to just give it up. This is AFTER receiving the portal account set up info and all that. Of course, they’re closed on holidays so no one to call, either. Does anyone have any info on the way Columbia handles such materials in reality?

Never mind, found it.