1. If you have a VPN, you can directly upload your demo video to YouTube with the VPN connected. Obtain and provide the video access link in the remarks for future approval.
2. If you do not have a VPN, compress the demo video file and other documents into a ZIP file and then upload it to the Attachment section in App Store Connect.
Note: App Store Connect cannot retain the previously uploaded attachment. Therefore, if you upload an attachment to App Store Connect, you need to save the video properly so that you can upload it again when the App is updated.