On many occasions I've had professors that will post assignment instruction documents on "Desire 2 Learn" or D2L, realize they made a mistake on those instructions, and tell us students either in class or via school email that they had made a mistake and what to do about it.
I have never once seen them simply replace the document itself.
I am not here to complain. I have heard that D2L is difficult to handle, and I've seen many professors get confused by it. I am just curious if D2L makes it difficult to replace files that have been posted, or if there might be some other reason why they don't bother updating their documents.