Hi @EmanMagdoub, glad to hear you're back to teach on Udemy!
Submitting a Test Video is not a requirement, but rather an effective way to receive feedback from our team and ensure your video quality is in line with our requirements before you start recording your course, or whenever you make changes to your recording setup.
Every time you update or create a new course, the standard process is to submit it for review. After your course has been submitted, the Process Review Team will evaluate your course and provide feedback on the course quality checklist. Once your course passes, it will be published and can be discovered in the Udemy marketplace.