Hi @Hasan A. If you don't mark some of your videos as 'free to preview', Udemy marks first few videos as 'free to preview' automatically, because prospective students often like to preview a few lectures of the course before deciding they want to purchase it or not. Regarding some of the videos not having the 'publish' button against them, know that only the new lectures you add, get the button 'publish' against them. If you had a video lecture already uploaded, and you are replacing it with a new video lecture, you will not get the 'publish' button against it - you are just updating your lecture with a new video. Hope this explains! Feel free to write back if you want more clarification on it. You can also write to instructorsupport@udemy.com if you have any other issue related to uploading the lectures.
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