HI @Jean1
Have you tried to view an access the files using the student view? What happens?
I would suggest you have someone else review your course settings and the permissions, perhaps there is something you missed in the process.
Can you send a couple of screen shots of your files?
And to be clear, in my previous comment, I meant copy/paste the text of a page from a previous course. It's good that you uploaded the files to the new course. But if you copied the text of the page from a previous course, the links might be pointing to a different course. I'm not sure if the link validator would catch this or not. Try relinking them on the page to see what happens. (but perhaps you have done that already).
Finally, I don't leave the file link available for students in the course menu. If you hid it, you no longer need to mess with file permissions. If you don't have need for students to go into your files because you have linked to them in your course, you could try hiding the Files link in the course navigation.
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