Sure, you can - but a course needs to have more than one video. The bare minimum is 5 videos covering a half hour (see https://support.udemy.com/hc/en-us/articles/229604988-Udemy-Course-Quality-Checklist), but just offering the bare minimum isn't enough in a competitive marketplace. Learners on Udemy have pretty high expecations. Make sure your video quality is excellent, and you will probably want to edit those videos to make them more interesting and to ensure anything you're writing or displaying is clearly visible even when viewed on a phone.
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