Uploading file works but students cannot access it

[michael_tsikerd]

I am using the API to upload a file, I am providing the user_id retrieved from canvas when obtaining the assignment submissions from the json response. Then I use that user_id in the following code:

link_url = request_url("%s/assignments/%d/submissions/%d/comments/files" %
(self.base_url, self.configuration.assignment_id, user_id), self.authorization_token,
payload={'name': filename}, method="post")

Then through the assignment comments, I, the instructor can access the file but students get an Access Denied message.

What user_id is supposed to be used when uploading? Currently it is a numeric identifier that canvas is providing for each student.

[jerry_nguyen]

@michael_tsikerd 

According to the documentation, once you upload a file to /assignments/id/submissions/userid/comments/files, you will get the file_id from the response. Then you will need to use that file_id in a PUT request to submission endpoint: https://canvas.instructure.com/doc/api/submissions.html#method.submissions_api.update

[michael_tsikerd]

I used that. It all works well. It just that I am the only one that can access the files and not my students. The students get an Access Denied error. This even though I use the user_id for each student that I get from Canvas. This by the way used to work a month ago.