Tried it, still fail :(
It's so frustrating dealing with aC's file upload interface really.
I wish aC could have progressing interface with hassle free, esp with the big files (20 - 50 mb).

Right now, my aC user is using 3rd party uploads (eg. wikisend.com) to upload files.
And that is an addition to the confusion again, since they'll put the file link on the Discussion (not in the Files section).

:(