Hi @Hadher, my guess is, you uploaded the videos to the bulk uploader's library, and now all you have to do is access your library to add content to your course, by clicking on Add From Library as you create or edit your lectures. You can learn more about the Bulk file uploader here. If this is not the issue, then I suggest you reach out firstname.lastname@example.org and the team will be happy to investigate further.
Hope this helps!
Udemy Community Team