I can't sent my presentation for brief. Buttons are not active

Good afternoon! Help me! I want to pay attention to my course and do everything possible to ensure that your platform does not work for a long time, no matter what you do. What I'm doing: I'm trying to upload slides to a Heuristic Assessment assignment. I suggested downloading the app to one long card, but the card continues to fail to activate. I tried to do this in another browser, but it didn't help. I tried to split the presentation into separate slides and upload it in parts, but it didn't help. I suggested turning on the vpn, suggested that it could be better than not downloading anything - nothing special. What other circles of hell do you need to go through to complete the task? Yes, and your AI robot is not helping..