New message attachment pane missing, but avail as draft
When I compose a new message and add an attachment, I cannot see it (even when attachment view is enabled). The twisty next to "1 Attachment" toggles up and down, but no attachment pane (1st image). But...
If I save the message as a draft, then reopen it, the pane appears (2nd image)!
Why is the pane missing in the new message compose window?