Hi @andrewschweitze ,
It seems strange that it isn't working for the students. I'd suggest three potential solutions:
1) try placing the pdf on to page and have it automatically open in-line preview then use that page as your QR code link. The page won't need to be in a module, just published.
2) Were the students logged on when they went to access it using their QR codes? That could be part of the issue (a long shot but worth checking)
3) Have you accidentally uploaded the file to your personal user files as opposed to the course files. This would lead to the issue you have described as only you can see your user files.
I hope one of these helps, let me know.
Stephen
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