I've never had a problem with my teachers being able to view my pdf file uploads. My teacher says that when she clicks on the assignment, my submission should automatically open up- but it doesn't. I have made sure to upload in the correct file format, pdf, but it's not solving the problem for her. I upload them from MacBook, but I don't think it should really matter whether I'm using Mac or Windows. I feel desperate for a solution.
Edit: My teacher also says she needs to see it because she won't download it.
FINAL UPDATE: The solution was to simply use a Windows computer. For some reason, the pdf file I downloaded onto my Macbook was different, I had noticed there was a tiny adobe acrobat logo/symbol on it. When I used Windows, the file had a little logo/symbol that said PDF. Also, I had downloaded this pdf file from the same source, an online research database that my college has- just using a Windows computer instead of a Mac. That was the difference.
Glad this tiny, but frustrating issue was finally solved!