Actually my reply still applies in this case. If i understand well, you uploaded a file into a group and want to move this file into a folder of this group.
So as long as you are the owner of the folder, you'll be able to do it. Simply edit the file, change the privacy to Add to an existing folder, select a folder belonging to the group and "voilà"
One thing that should be improved is depending on the current scope, it should be possible to list the folders of the scope. For instance, in a group, you should be able to include any folder of the group or maybe restrict the folders to the one created in the group. I'll need to think about it ;)