I used to add attachments in Gmail by dragging and dropping files directly from Explorer. It doesn't work any more. Was this feature dropped with the new design?
Did Gmail drag and drop attachments get dropped in new design?
gmail;drag and drop
It looks like internet explorer is not a supported browser for the drag and drop now. I tried it on Chrome and it worked, where as it did not on Internet Explorer (see pic)I would suggest switching to a new browser otherwise you will not be able to use this feature.