Yes, I understand. Sorry, I really need to start a "canned" response database, but alas, I have yet to do so.
There are many posts about this on the forum, most from user, "DavidR" that explains that you must create an "exceptions" folder on your computer that Avast will not scan, restore the file in the chest to that directory, then upload the file.
I'll look around on the forum to find instructions for you, just hold on a min.
(I'm on a linux machine right now, and don't have avast installed, so I can't walk through the steps myself at the moment).