Hello @RenzoGiraldo
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with submitting screencast videos. If you have a direct URL for the video and the video is public, yes you should be able to submit it to any assignment or discussion as long as you have the option to type out the test directly. You could also consider downloading the video and uploading it, but it would be easier to copy the video URL and paste it to your assignments if your teacher allows that (most would) Hope this helps!
