I am currently using Modules to organize my assignments, quizzes, and information for my classes. I'd like to be able to add Files to each module so the students can download homework or papers that were passed out in class if they lost them or forgot them at school. When I upload a .pdf, it works fine and I can see the preview of the file. When I upload straight from Google Drive, however, I get a grey box with an error message instead of a preview. Since Google Drive is already authorized on my account, I thought I would be able to upload .gdocs, .gslides, etc. None of those seem to be working, however. Are they not able to be integrated or am I missing something here?