When a student submits an assignment as a Word .docx document using Firefox or Chrome on Windows or OSX. Crocodoc preview will show an error that the file cannot be previewed. When the professor downloads the file, the Word document is 0 bytes and will not even open in Word. Professors may think the student is trying to “pull a fast one” by saving a blank file, but even a blank Word document is several KB in size.
If a student still has a file open when they attempt to uploaded it this error will occur. Clear the attempt and tell the student to close the file in MS Word before submitting it.