How to let Open AI read PDF and comment on it?

I am trying to write script in which Open AI reads a certain PDF and comments on it.
I am using:
documents = SimpleDirectoryReader(‘path of the PDF’).load_data()
I am working in the anaconda cloud right now. no desktop version. I uploaded a PDF to the cloud but I cannot figure out, how to get the path of this PDF to be integrated in this line of code.
Any help would be appreciated.
Thank you