I have Assignment Enhancements active in my classes, and in the past week or so documents submitted through Google Drive (both the old one and new LTI 1.3 since our school has both active) do not load in Speed Grader. With the old Google Drive app, I need to download and change the extension to .docx to view them. With the LTI 1.3, the file is completely corrupt and won't open.
The issue is completely resolved if I turn off Assignment Enhancements.